Question

Find out the valency of the atoms represented by the Fig (a) and (b).

Answer 1

1. It has electronic configuration = 2,8,8. Its outermost shell has a complete octet. Hence, its valency = 0.
2. It has electronic configuration = 2, 7. It can easily gain one electron to complete its outermost octet.
   Hence, its valency = –1.