Within each pair of elements of
Question:

Within each pair of elements of $\mathrm{F}$ \& $\mathrm{Cl}, \mathrm{S} \& \mathrm{Se}$, and Li \& Na, respectively, the elements that release more energy upon an electron gain are-

1. F, Se and $\mathrm{Na}$

2. $\mathrm{F}, \mathrm{S}$ and $\mathrm{Li}$

3. $\mathrm{Cl}, \mathrm{S}$ and $\mathrm{Li}$

4. $\mathrm{Cl}, \mathrm{Se}$ and $\mathrm{Na}$

Correct Option: , 3

Solution: