Question

3) Atomic number of a few elements are given below (1+1+1) = 3

10, 20, 7, 14

(a) Identify the elements

(b)What would be the electronic configuration for each of these elements?

(c) Determine the valency of these elements
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Answer 1

a) Elements-Neon(Ne),Calcium (Ca),Nitrogen (N).Silicon (Si)

b) Group-18,2,15,14

c) Period-2,4,2,3

d) Electronic configuration-(2,8);(2,8,8,2);(2,5);(2,8,4)

e) Valency-0,2,3,4