Q.

Which one of the following has a maximum tendency to form M^3 ion?

A. N
B. Bi
C. P
D. As
Answer» A. N
Explanation: Thee 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 has configuration, forming nitride N3- ions.
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