Question

In which of the following, the chemical properties are similar:
A(Z:9) , B(Z:12) , C(Z:20) , D(Z:17) , E(Z:19)?

Answer 1

A(Z:9)andD(Z:17);B(Z:12) and C(Z:20) have similar chemical property.

Explanation:

since,

electronic configuration of A is 2.7

electronic configuration of D is 2.8.7

again,

electronic configuration of B is 2.8.2

electronic configuration of C is 2.8.8.2