Which one of the following has a maximum tendency to form M³ ion ?

A. N

B. Bi

C. P

D. As

Answer: Option A

Solution(By Examveda Team)

The general electronic configuration of group 15 elements (N, P, As, Sb and Bi) is ns²np³. Since Nitrogen has smallest size and greatest electronegativity in the family, it may gain three electrons and attain noble gas configuration, forming nitride N^3- ions. The other members show little tendency to form tri-negative M^3- ions. Their electronegativity is so low that they would generally form covalent compounds even with highly electropositive elements.