Question

Element A lies in group 15 as mentioned below:
Group 15
A
(i)What is the valency of the element A?
(ii)What is the electronic configuration of the element A?

Answer 1

Element A lies in group 15 . The element will have 5 valence electrons. Hence , it can gain 3 electrons or can lose 5 electrons to noble gas electronic configuration.
1) The valency of element A is 3 or 5.
2) It can have electronic configuration as :
Nitrogen (N) = 2,5
Phosphorous (P) = 2,8,5
Arsenic (Ar) = 2,8,18,5
Antimony (Sb) = 2,8,18,18,5
Bismuth (Bi) = 2,8,18,32,18,5