Within each pair of elements


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

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

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

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

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

Correct Option: , 2


Generally, electron affinity decreases on moving down a group. Chlorine has more electron affinity than F because of very small size of fluorine. Therefore chlorine, sulphur and Li has higher electron affinity among given groups.

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