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ICSE Class X Notes 2020 : Chemistry : Periodic Table

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Aneeta Srivastava
Greenfields School, Lucknow

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Chapter 1. The Periodic Properties and Their Variations Short Questions Question 1: State Newland s law of octaves. Why did the law of Octaves fail ? Write three important drawbacks of Newland s classification. Answer: Newland s Law of Octaves: The elements with similar properties occur each time after every seven elements. Just the same way as the repetition of musical node in a octave. The law failed because of the following reasons: (1) The law was applicable only upto calcium. It could not include the other elements beyond calcium. (ii) With the discovery of rare gases, it was the ninth element and not the eighth element having similar chemical properties. Drawbacks: (i) Newland found that elements could not be fitted into the table. (ii) Atomic weights were not correctly estimated. (iii) Certain elements did not fit into the scheme. Question 2: Answer the following questions regarding Mendeleev s modified Periodic Table. ( ) How many periods are there in Mendeleev s Periodic Table? (ii) How many groups are there in Mendeleev s Periodic Table? (iii) How many groups consist of normal elements and transitional elements in Mendeleev s Periodic Table?

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