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NSW HSC 2007 : CHEMISTRY

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2007 H I G H E R S C H O O L C E R T I F I C AT E E X A M I N AT I O N Chemistry Total marks 100 General Instructions Reading time 5 minutes Working time 3 hours Write using black or blue pen Draw diagrams using pencil Board-approved calculators may be used A data sheet and a Periodic Table are provided at the back of this paper Write your Centre Number and Student Number at the top of pages 9, 13, 15, 17 and 21 S ection I Pages 2 23 75 marks This section has two parts, Part A and Part B Part A 15 marks Attempt Questions 1 15 Allow about 30 minutes for this part Part B 60 marks Attempt Questions 16 27 Allow about 1 hour and 45 minutes for this part S ection II Pages 25 35 25 marks Attempt ONE question from Questions 28 32 Allow about 45 minutes for this section 115 Section I 75 marks Part A 15 marks Attempt Questions 1 15 Allow about 30 minutes for this part Use the multiple-choice answer sheet for Questions 1 15. 1 Which of the following is a renewable resource? (A) Ethanol (B) Uranium (C) Petroleum (D) Aluminium 2 What type of reaction describes the polymerisation of glucose into cellulose? (A) Addition (B) Hydrolysis (C) Substitution (D) Condensation 3 In a galvanic cell, what is the pathway of electron flow? Direction Medium (A) anode to cathode salt bridge (B) anode to cathode external wire (C) cathode to anode salt bridge (D) cathode to anode external wire 2 4 What is the IUPAC name for the following compound? HHH C H H H H C C C C C C H H H H H OH H H H (A) Hexan-3-ol (B) Hexan-4-ol (C) Heptan-3-ol (D) Heptan-5-ol 5 The diagram represents a cell in which two metals have been placed in a solution containing their respective metallic ions. The metals are connected to a voltmeter. V Which of the following combinations of metals would produce the highest reading on the voltmeter? (A) Tin and zinc (B) Copper and zinc (C) Copper and silver (D) Magnesium and lead 6 Which aqueous solution turns phenolphthalein pink? (A) HCl (B) NaCl (C) NaOH (D) CH3OH 3 7 Which graph represents the enthalpy change for an acid-base neutralisation reaction? Enthalpy (B) Enthalpy (A) Reaction progress Reaction progress Enthalpy (D) Enthalpy (C) Reaction progress 8 Reaction progress Acid X and acid Y are both monoprotic weak acids of equal concentration. Acid X is a stronger acid than acid Y. Which statement about acid X and acid Y is correct? (A) Acid Y is completely ionised in solution. (B) The solution of acid X is less ionised than the solution of acid Y. (C) The solution of acid X has a lower pH than the solution of acid Y. (D) 1 mole of acid Y requires a greater volume of 1.0 mol L 1 NaOH for neutralisation than 1 mole of acid X. 9 Which of the following aqueous solutions has a pH greater than 7? (A) Sodium citrate (B) Sodium chloride (C) Ammonium nitrate (D) Ammonium chloride 4 10 A 0.1 mol L 1 HCl solution has a pH of 1.0 . What volume of water must be added to 90 mL of this solution to obtain a final pH of 2.0? (A) 10 mL (B) 180 mL (C) 810 mL (D) 900 mL 11 What is the consequence of having large concentrations of Mg2+ and Ca2+ ions in waterways? (A) Turbidity (B) Hardness (C) Eutrophication (D) Heavy metal contamination 12 Which of the following is always produced during combustion of fossil fuels? (A) Water (B) Carbon (soot) (C) Sulfur dioxide (D) Carbon dioxide 13 Consider the following reaction at equilibrium. N2(g) + 3H2(g) 2NH3(g) H = 92 kJ mol 1 What would be the effect of a decrease in pressure on this system? (A) Heat will be absorbed. (B) The equilibrium will not be disturbed. (C) The concentration of NH3 will increase. (D) The reverse rate of reaction will decrease. 5 14 Which statement about Atomic Absorption Spectroscopy (AAS) is correct? (A) AAS is an effective qualitative technique but it cannot be used for quantitative analysis. (B) AAS measures the wavelengths of light emitted when electrons fall back to their ground state. (C) In AAS, white light is shone through a vaporised sample in order to observe which wavelengths are absorbed. (D) The wavelength of light used in AAS matches one of the spectral lines produced when the sample is analysed by a flame test. 15 The following equations show the overall effect of the presence of chlorine free radicals ( Cl) on ozone in the stratosphere. Cl + O3 ClO + O2 ClO + O Cl + O2 Which term best describes the role of the chlorine free radical in this process? (A) Anion (B) Catalyst (C) Initiator (D) Oxidant 6 BLANK PAGE 7 BLANK PAGE 8 Board of Studies NSW 2007 2 007 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Chemistry Centre Number Section I (continued) Part B 60 marks Attempt Questions 16 27 Allow about 1 hour and 45 minutes for this part Student Number Answer the questions in the spaces provided. Show all relevant working in questions involving calculations. Marks Question 16 (5 marks) The diagram represents a section of the layered structure of Earth s atmosphere. Y 35 km X 15 km Earth (a) Identify the layers of atmosphere labelled X and Y. X (b) ............................................................................. Y ............................................................................. Ozone is a gas found in layers X and Y. Explain the effect of ozone in each of these layers. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... 116 1 9 4 Marks Question 17 (4 marks) Each of the four bottles contains one of the following solutions: barium nitrate hydrochloric acid lead nitrate sodium carbonate. solution 1 solution 2 solution 3 solution 4 A student mixed pairs of these solutions together and obtained the following results. Reactants Observation solution 1 and solution 2 bubbles solution 2 and solution 3 white precipitate solution 2 and solution 4 no reaction solution 1 and solution 3 white precipitate solution 1 and solution 4 white precipitate (a) Write a correctly balanced equation to represent the reaction between solution 1 and solution 2. ............................................................................................................................... Question 17 continues on page 11 10 1 Marks Question 17 (continued) (b) Use the information to identify the four solutions. Solution 2 Identity 1 2 3 4 (c) Why would it be inappropriate to use flame tests to identify these solutions? 1 ............................................................................................................................... ............................................................................................................................... Question 18 (3 marks) Describe the role of a chemist employed in an industry or enterprise, and a chemical principle used by the chemist. (Choose an occupation other than teaching.) ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... 11 3 BLANK PAGE 12 Board of Studies NSW 2007 2 007 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Chemistry Centre Number Section I Part B (continued) Student Number Marks Question 19 (7 marks) There are many benefits and problems associated with the use of radioisotopes in industry and medicine. Evaluate the impact on society of the use of radioisotopes in both industry and medicine. In your answer, give examples of specific radioisotopes, making reference to their chemical properties. ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... 117 13 7 Marks Question 20 (4 marks) The diagram represents a typical car battery. H2SO4 solution PbO2 Pb Chemistry 2, HSC Course, by Thickett, Jacaranda Science / Wiley, 1st Edition, 2006; Reprinted with permission of John Wiley & Sons Australia As the battery discharges, the following half reactions occur: Pb(s) + SO2 (aq) PbSO4(s) + 2e 4 PbO2(s) + SO2 (aq) + 4H+(aq) + 2e PbSO4(s) + 2H2O(l) 4 (a) Identify the anode, then write the equation that represents the overall chemical reaction. 2 ............................................................................................................................... ............................................................................................................................... (b) Explain one benefit of car batteries lasting several years. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... 14 Board of Studies NSW 2007 2 2 007 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Chemistry Centre Number Section I Part B (continued) Student Number Marks Question 21 (5 marks) Red cabbage indicator chart Colour pH (a) red 1 violet 2 3 4 purple 5 6 blue 7 8 green 9 10 yellow 11 12 13 14 State what colour the red cabbage indicator would be in a 0.005 mol L 1 solution of H2SO4. Show your working. 1 ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... (b) Using the red cabbage indicator, what colour would the solution be if 10 mL of 0.005 mol L 1 H2SO4 was diluted to 100 mL? 1 ............................................................................................................................... ............................................................................................................................... (c) What volume of 0.005 mol L 1 KOH is required to neutralise 15 mL of the diluted solution of H2SO4? ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... 118 15 3 Marks Question 22 (7 marks) The following article was sourced from the internet. In 2004, Australia s Minister for the Environment announced that the allowable amounts of sulfur in unleaded petrol and diesel would be reduced over the next 5 years. Currently sulfur in diesel is 500 parts per million (ppm) but it will be cut to 50 ppm on 1 January 2006 and capped at 10 ppm from January 2009. (a) Calculate the volume of sulfur dioxide produced when a full tank (capacity 60 kg) of diesel is consumed at 25 C and 100 kPa in November 2007. 3 ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... (b) Evaluate the effect of the sulfur reduction policy on the environment. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... 16 Board of Studies NSW 2007 4 2 007 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Chemistry Centre Number Section I Part B (continued) Student Number Marks Question 23 (3 marks) When hexanoic acid and ethanol are mixed together under certain conditions, esterification occurs. Describe the conditions necessary for this reaction and give the structural formulae and names of the products. ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... 118a 17 3 Marks Question 24 (5 marks) The heats of combustion ( Hc ) of three alkanols were determined. The results are shown in the table. Alkanol Heat of combustion ( kJ mol 1) methanol ethanol 920 butan-1-ol (a) 480 1800 Plot a graph of the heat of combustion versus the molecular weight for the three alkanols. Molecular weight Question 24 continues on page 19 18 3 Marks Question 24 (continued) (b) (i) Use the graph to estimate the heat of combustion of propan-1-ol. 1 ................................................................................................................... ................................................................................................................... (ii) The theoretical value for the heat of combustion of propan-1-ol is more than 2000 kJ mol 1. Suggest a chemical reason, other than heat loss, for the difference between this value and the estimated value from part (b) (i). ................................................................................................................... ................................................................................................................... End of Question 24 19 1 Marks Question 25 (5 marks) Sodium hydrogen carbonate, NaHCO3, is commonly used to neutralise chemical spills that are a potential hazard to the environment. Assess the effectiveness of NaHCO3 in this role, with reference to its chemical properties. ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... 20 Board of Studies NSW 2007 5 2 007 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Chemistry Centre Number Section I Part B (continued) Student Number Marks Question 26 (4 marks) Explain how the structure and properties of polyethylene and polystyrene relate to the way each is used. ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... 119 21 4 Marks Question 27 (8 marks) The diagrams represent equipment used in an investigation to determine the chloride ion concentration in a water sample. Sintered glass filter AgNO3 solution Precipitate Vacuum pump Water sample Filtrate Figure 1 Figure 2 Reproduced by Permission of Macmillan Education Australia (a) Describe how you could, using the equipment in the diagram, determine the chloride ion concentration in a water sample. Include a balanced equation. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... Question 27 continues on page 23 22 3 Marks Question 27 (continued) (b) If the volume of the water sample being tested is 50.0 mL and the mass of the dried precipitate obtained is 3.65 g, calculate the chloride ion concentration in the water sample in ppm. 3 ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... (c) Why is it important to determine the chloride ion concentration in water? ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... End of Question 27 23 2 BLANK PAGE 24 Board of Studies NSW 2007 2 007 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Chemistry Section II 25 marks Attempt ONE question from Questions 28 32 Allow about 45 minutes for this section Answer the question in a writing booklet. Extra writing booklets are available. Show all relevant working in questions involving calculations. Pages Question 28 Question 29 Shipwrecks, Corrosion and Conservation ............................ 28 29 Question 30 The Biochemistry of Movement .......................................... 30 31 Question 31 The Chemistry of Art ........................................................... 32 33 Question 32 120 Industrial Chemistry ............................................................. 26 27 Forensic Chemistry .............................................................. 34 35 25 Marks Question 28 Industrial Chemistry (25 marks) (a) The diagram is a flowchart of the reactions involved in an important industrial process. NaCl(aq) brine purification ammonia absorber water lime dissolver NaCl(aq) Ca(OH)2(aq) NH3(g) NH3(aq) heat CaCl2(aq) NH4Cl CaO(s) tower NH4Cl filter NaHCO3 CaCO3(s) CO2(g) furnace NaHCO3 heat water Na2CO3(s) (i) Identify this industrial process and write a balanced equation to represent the overall chemical reaction that occurs. 2 (ii) The products of the reaction formed in the tower are sodium hydrogen carbonate and ammonium chloride. 2 Describe how these two substances are separated. Question 28 continues on page 27 26 Marks Question 28 (continued) (b) Over the past century the production of sodium hydroxide has evolved from the mercury process, to the diaphragm process, to the membrane process. 6 Analyse the factors that contributed to each of the changes in the production process. (c) Hydrogen sulfide can be removed from natural gas via the following process. 2H2S(g) + SO2(g) 3S(s) + 2H2O(g) H = 145 kJ mol 1 (i) Write the equilibrium constant expression for this reaction. 1 (ii) Calculate the equilibrium constant, when 1.00 mol of H2S and 1.00 mol of SO2 react in a 1.00 L vessel at 373 K to give 0.50 mol of water vapour under equilibrium conditions. 2 (iii) Identify FOUR factors that would maximise the removal of H2S(g) in this reaction. 2 (d) Describe the impact that saponification products have had on society and the environment. 4 (e) You performed a first-hand investigation to model an equilibrium reaction. (i) Outline the procedure used and the results you obtained. 2 (ii) Identify a risk associated with this procedure. 1 (iii) Describe how this procedure models equilibrium and state a limitation of the model. 3 End of Question 28 27 Marks Question 29 Shipwrecks, Corrosion and Conservation (25 marks) (a) The diagram shows an electrolytic cell. Graphite rods P Q A coating builds up on electrode P Bubbles of gas form on electrode Q Dilute copper sulfate solution (i) Explain why graphite rods are used in an electrolytic cell. 2 (ii) Describe, with the use of half equations, the processes that occur at the anode and cathode. 2 (b) Corrosion is a major problem for vessels that have to operate in a variety of aquatic environments. 6 Analyse how the factors in aquatic environments have impacted on the choice of metals used in the construction of vessels over time. Question 29 continues on page 29 28 Marks Question 29 (continued) (c) The diagram represents three separate petri dishes each containing a mixture of agar, sodium chloride solution, phenolphthalein and an indicator which turns blue in the presence of Fe2+. Nails are added to each dish. Mg Cu blue blue pink blue Dish A Nail blue pink Dish B Nail with Cu wire pink pink Dish C Nail with Mg ribbon (i) Why does the mixture contain sodium chloride solution? 1 (ii) Write two half equations to explain the presence of the blue and pink colours in dish B. 2 (iii) In which dish would the nail be protected from corrosion? Explain your answer. 2 (d) The work of early scientists has increased our understanding of electron transfer reactions. Describe the impact of this work on society. 4 (e) You performed a first-hand investigation to compare and describe the rate of corrosion of metals in different acidic and neutral solutions. (i) Outline the procedure used and the results you obtained. 2 (ii) Identify a risk associated with this procedure. 1 (iii) Use your results to explain why shipwrecks at great depth experience accelerated corrosion. 3 End of Question 29 29 Marks Question 30 The Biochemistry of Movement (25 marks) The flowchart outlines an important biological process. (a) Proteins Carbohydrates Lipids Amino acids Glucose Fatty acids and glycerol Glycolysis CO2 W Acetyl-CoA (i) 2 (ii) (b) Identify substance W and the site where it undergoes oxidation to form acetyl-CoA. Identify the form in which energy is captured, and account for the overall number of these molecules produced per glucose molecule during glycolysis. 2 In the study of chemistry, scientists use models to test and relate ideas. Analyse how the use of models or diagrams has contributed to our understanding of the structure and chemical features of carbohydrates, fats and proteins. Question 30 continues on page 31 30 6 Marks Question 30 (continued) (c) (i) State an IUPAC name for the substance with the common name, lactic acid, C3H6O3. 1 (ii) Using structural formulae, write the balanced equation for the formation of lactic acid in anaerobic respiration. 2 (iii) The production of lactic acid results in a change in cellular pH. 2 Explain the impact this would have on muscles. (d) Describe how knowledge of aerobic respiration has increased our understanding of muscle activity during gentle exercise. (e) 4 You performed a first-hand investigation to observe the effect of changes in pH on the reaction of a named enzyme. (i) Outline the procedure used and the results you obtained. 2 (ii) Identify a risk associated with this procedure. 1 (iii) Enzymes will only function at a specific pH. Explain this in terms of their structure. 3 End of Question 30 31 Marks Question 31 The Chemistry of Art (25 marks) (a) The electron spin orbital diagram represents the 3d and 4s electrons for an element in the first transition series. 3d 4s (i) 3 (ii) (b) Identify this element and explain the arrangement of electrons in these sub-shells in terms of the Pauli exclusion principle and Hund s rule. This element can form an ion with an oxidation state of +3. In your writing booklet, draw an electron spin orbital diagram to represent this ion. 1 In the study of chemistry, scientists use models to test and relate ideas. 6 Analyse the contribution of using Lewis models in the development of our understanding of the structure of complex ions formed by transition metals. Use specific examples in your answer. (c) Transition elements can have variable oxidation states. (i) 1 (ii) Explain which of these two species would be the stronger oxidising agent. 2 (iii) (d) Determine the oxidation state of manganese in MnO4 and MnO2. Write a half-equation to represent the oxidation of the Cr 3+(aq) ion to form the acidified dichromate ion Cr2O 7 2 (aq) and give an example of an oxidising agent that would cause this to happen. 2 Describe how our understanding of the chemistry of specific pigments used by an ancient culture has influenced our choice of pigments used today. 4 Question 31 continues on page 33 32 Marks Question 31 (continued) (e) You have performed a first-hand investigation to observe the flame colour of a number of different cations. (i) Outline the procedure you used to identify the Sr2+ ion. 2 (ii) Identify a risk associated with this procedure. 1 (iii) Explain how the flame colour of the Sr2+ ion relates to electron excitation and emission spectra. 3 End of Question 31 33 Marks Question 32 Forensic Chemistry (25 marks) (a) The structure represents fructose. H HO C H H O C C H OH H C C C OH H H OH OH (i) What is the molecular formula for this compound? 1 (ii) Sucrose is a disaccharide formed from fructose and another monosaccharide. 3 Identify the other monosaccharide and explain why these two monosaccharides are reducing sugars whereas sucrose is not. (b) Evaluate the implications of the use of DNA as an identification molecule for society. Question 32 continues on page 35 34 6 Marks Question 32 (continued) (c) (i) What is the general structural formula for an amino acid? (ii) The structure represents a specific dipeptide. 1 2 H H O H C HO C C C N C C H H H N H H H OH H Using structural formulae, write a balanced equation to show the cleaving of the peptide bond. (iii) Outline how proteins can be broken into different lengths in the chain. (d) Describe how the results of some forensic investigations are improved by the use of mass spectrometry. 2 4 (e) You performed first-hand investigations to separate mixtures by both chromatography and electrophoresis. (i) Describe the chromatography procedure you used. 2 (ii) Identify a risk associated with this procedure. 1 (iii) Explain how the different properties of mixtures enable them to be separated by chromatography and electrophoresis. 3 End of paper 35 BLANK PAGE 36 Board of Studies NSW 2007 2 007 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Chemistry DATA SHEET Avogadro constant, NA .................................................................. 6.022 1023 mol 1 Volume of 1 mole ideal gas: at 100 kPa and at 0 C (273.15 K) ...................... 22.71 L at 25 C (298.15 K) .................... 24.79 L Ionisation constant for water at 25 C (298.15 K), Kw ................. 1.0 10 14 Specific heat capacity of water ..................................................... 4.18 103 J kg 1 K 1 Some useful formulae H = m C T pH = log10 [H+ ] Some standard potentials K+ + e K(s) 2.94 V Ba2+ + 2e Ba(s) 2.91 V Ca(s) 2.87 V Na(s) 2.71 V Mg(s) 2.36 V Al(s) 1.68 V 2+ Ca + 2e + Na + e Mg 2+ 3+ Al Mn + 2e + 3e 2+ + 2e Mn(s) 1.18 V H2O + e 1 H2(g) 2 Zn2+ + 2e Zn(s) 0.76 V Fe2+ + 2e 2+ Ni Sn 2+ Pb 2+ 0.83 V Fe(s) 0.44 V Ni(s) 0.24 V Sn(s) 0.14 V Pb(s) 0.13 V + 2e + 2e + 2e + 1 H2(g) 2 H +e 2 SO4 + OH + SO2(aq) + 2H2O 0.16 V Cu2+ + 2e Cu(s) 0.34 V 1 O2(g) + H2O + 2e 2 2OH 0.40 V Cu(s) 0.52 V + + 4H + 2e 0.00 V Cu + e 1 I2(s) + e 2 1 I2(aq) + e 2 3+ I I Fe 0.77 V Ag+ + e Ag(s) 0.80 V 1 Br2(l ) + e 2 Br 1.08 V Br 1.10 V H2O 1.23 V Fe +e + 2H + 2e 1 Cl2(g) + e 2 1 Cr2O72 + 7H+ + 3e 2 1 Cl2(aq) + e 2 MnO4 + 8H+ + 5e 1 F2(g) + e 2 120a 0.62 V 2+ +e 1 Br2(aq) 2 1 O2(g) + 2 0.54 V Cl 3+ Cr 1.36 V + 7 H2O 2 1.36 V Cl 1.40 V Mn2+ + 4H2O 1.51 V F 2.89 V Aylward and Findlay, SI Chemical Data (5th Edition) is the principal source of data for this examination paper. Some data may have been modified for examination purposes. 37 38 4 Be 9.012 12 Mg 24.31 Magnesium 20 Ca 40.08 Calcium 38 Sr 87.62 Strontium 56 Ba 137.3 Barium 88 Ra [226] Radium Lithium 11 Na 22.99 Sodium 19 K 39.10 Potassium 37 Rb 85.47 Rubidium 55 Cs 132.9 Caesium 87 Fr [223] Francium Zirconium Yttrium Rutherfordium 104 Rf [261] Hafnium Cerium 90 Th 232.0 Thorium Lanthanum Actinoids 89 Ac [227] Actinium Lanthanoids 57 58 La Ce 138.9 140.1 Actinoids 89 103 Lanthanoids 72 Hf 178.5 40 Zr 91.22 39 Y 88.91 57 71 Titanium 22 Ti 47.87 Scandium 21 Sc 44.96 Protactinium 91 Pa 231.0 Praseodymium 59 Pr 140.9 Dubnium 105 Db [262] Tantalum 73 Ta 180.9 Niobium 41 Nb 92.91 Vanadium 23 V 50.94 Uranium 92 U 238.0 Neodymium 60 Nd 144.2 Seaborgium 106 Sg [266] Tungsten 74 W 183.8 Molybdenum 42 Mo 95.94 Chromium 24 Cr 52.00 Hassium Bohrium Neptunium 93 Np [237] Promethium Plutonium 94 Pu [244] Samarium 62 Sm 150.4 108 Hs [277] 107 Bh [264] 61 Pm [145] Osmium 76 Os 190.2 Ruthenium 44 Ru 101.1 Iron 26 Fe 55.85 Rhenium 75 Re 186.2 Technetium 43 Tc [97.91] Manganese 25 Mn 54.94 Atomic Weight Atomic Number Americium 95 Am [243] Europium 63 Eu 152.0 Meitnerium 109 Mt [268] Iridium 77 Ir 192.2 Rhodium 45 Rh 102.9 Cobalt 27 Co 58.93 Gold 79 Au 197.0 KEY 111 Rg [272] Gold 79 Au 197.0 Silver 47 Ag 107.9 Copper 29 Cu 63.55 Curium 96 Cm [247] Gadolinium 64 Gd 157.3 Berkelium 97 Bk [247] Terbium 65 Tb 158.9 Darmstadtium Roentgenium 110 Ds [271] Platinum 78 Pt 195.1 Palladium 46 Pd 106.4 Nickel 28 Ni 58.69 Name of element Symbol of element Californium 98 Cf [251] Dysprosium 66 Dy 162.5 Mercury 80 Hg 200.6 Cadmium 48 Cd 112.4 Zinc 30 Zn 65.41 PERIODIC TABLE OF THE ELEMENTS 6 C 12.01 Einsteinium 99 Es [252] Holmium 67 Ho 164.9 Thallium 81 Tl 204.4 Indium 49 In 114.8 Gallium 31 Ga 69.72 Aluminium Fermium 100 Fm [257] Erbium 68 Er 167.3 Lead 82 Pb 207.2 Tin 50 Sn 118.7 Germanium 32 Ge 72.64 Silicon 14 Si 28.09 Boron 13 Al 26.98 Carbon 5 B 10.81 Mendelevium 101 Md [258] Thulium 69 Tm 168.9 Bismuth 83 Bi 209.0 Antimony 51 Sb 121.8 Arsenic 33 As 74.92 Phosphorus 15 P 30.97 Nitrogen 7 N 14.01 Nobelium 102 No [259] Ytterbium 70 Yb 173.0 Polonium 84 Po [209.0] Tellurium 52 Te 127.6 Selenium 34 Se 78.96 Sulfur 16 S 32.07 Oxygen 8 O 16.00 Lawrencium 103 Lr [262] Lutetium 71 Lu 175.0 Astatine 85 At [210.0] Iodine 53 I 126.9 Bromine 35 Br 79.90 Chlorine 17 Cl 35.45 Fluorine 9 F 19.00 Xenon 54 Xe 131.3 Krypton 36 Kr 83.80 Argon 18 Ar 39.95 Neon 10 Ne 20.18 Helium 2 He 4.003 Radon 86 Rn [222.0] For elements that have no stable or long-lived nuclides, the mass number of the nuclide with the longest confirmed half-life is listed between square brackets. The International Union of Pure and Applied Chemistry Periodic Table of the Elements (October 2005 version) is the principal source of data. Some data may have been modified. Beryllium 3 Li 6.941 Hydrogen 1 H 1.008

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