Question

Which of the following set has the strongest tendency to form anions

• A. Ga, In and Te
• B. Na, Mg and Al
• C. N, O and F
• D. V, Cr and Mn

Answer 1

The correct option is C

N, O and F

What's common in the series of elements in which they are given?

They are from the same group or same period. Firstly, we will check out their groups.

$Ga,In,Te$ Group 13

$Na,Mg,Al⟶$ $3^{rd}$ period

$N,O,F^{-}$ $2^{nd}$ period V,

$Cr,Mn⟶$ $4^{th}$ period

We know that,

Electron gain enthalpy $\alpha$ Effective nuclear charge

Check out atomic radius for all series of elements. From these series, we can say that

N, O, and F are smallest

Therefore, N, O, and F have the strongest tendency to form anions.