Question

32. a) State Modern periodic law.
b) Which element has :
i) two shells, both of which are completely filled with electrons.
ii) twice as many electrons in its second shell as in its first shell
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Answer 1

Answer:

a) Modern periodic law --->

Chemical and Physical Properties of elements

are a periodic function of their atomic number.

b)

(i) two shells, both of which are completely filled with electrons is Neon.

Explanation :-

Neon belong second period of Modern periodic table. It has two shells and they both are completely filled (2,8 - electronic configuration of neon)

(ii) The elements which has twice electrons in its second shell as in its first shell is Carbon.

Explanation :-

Carbon has two shells . In its first shell two electron are there and in its second shell 4 electrons are present.(2,4 - electronic configuration of Carbon).

Hope it helps you.