Trending ▼   ResFinder  

ICSE Notes 2016 : Physics (Vidya International School (VIS), Yeola)

2 pages, 1 questions, 1 questions with responses, 5 total responses,    0    0
$ω@T!*
Ashoka Universal School (AUS), Nashik
11th-12th
+Fave Message
ProfileTimelineUploads
 Home > swati22 >   F Also featured on: School Page

Formatting page ...

Nuclear Physics 1. An atom is the smallest unit of an element, which may or may not exist independently, but always takes part in a chemical reaction. 2. The central core of the atom is called nucleus. The nucleus contains protons and neutrons. 3. Neutrons and protons are collectively called nucleons. 4. Protons are positively charged particles, having a charge equal to 1.6 l0 19C and mass equal to 1.67 10 27 kg. 5. Neutrons are electrically neutral particles, having a mass slightly more than the protons. 6. Electrons are negatively charged particles, revolving around the nucleus. Their mass is equal to 9.1 10 31 kg and charge equal to 1.6 l0 19C. 7. An atom is electrically neutral, i.e., number of protons is equal to number of electrons. 8. A Z X represents the symbol for an atom of any element. X is the name of the element, A is the mass number of the element and Z is the atomic number of the element. 9. The number of nucleons in the atom of an element is called its mass number. 10. The number of protons in an atom is called atomic number. 11. The atoms of same element, having same atomic number, but different mass number are called isotopes. Class-X 1 Key points 12. The atoms of different elements, having different atomic number, but same mass number are called isobars. 13. The property due to which the nucleus of an element decays into the nucleus of some other element, with the ejection of alpha particles or beta particles or gamma radiations is called radioactivity. 14. Radioactive elements are those, whose nucleus decays into nucleus of some other element, with the ejection of alpha particles or beta particles or gamma radiations. 15. -particles are helium nucleus or doubly ionised helium atoms which have lost two electrons. 16. -particles are negatively charged particles, having a charge of 1.6 l0 19C and mass 9.106 l0 31 kg. 17. -radiations are electromagnetic waves, having wavelength less than 0.01 . 18. Law of -emission : When a radioactive nucleus ejects an -particle, its mass number decreases by 4 a.m.u. and atomic number by 2 a.m.u, such that it occupies a position, two places behind in periodic table as compared to its original position. 19. Law of -emission : When the nucleus of an element ejects a particle, its mass number remains the same, but its atomic number increases by one a.m.u. and hence its position is one place ahead in the periodic table, as compared to its original position. 20. Law of -radiation : During gamma emission, the mass number and atomic number remain unchanged, and hence, no new element is formed. Class-X 2 Key points

Formatting page ...

Top Contributors
to this ResPaper
(answers/comments)


$ω@T!*
(6)

Skaar
(5)

Anisha shruti
(1)

Advait
(1)

 

  Print intermediate debugging step

Show debugging info


 

 

© 2010 - 2025 ResPaper. Terms of ServiceContact Us Advertise with us

 

swati22 chat