Within each pair of elements $\mathrm{F}\&\mathrm{C}\mathrm{l},\mathrm{S}\&\mathrm{S}\mathrm{e}$ and $\mathrm{L}\mathrm{i}\&\mathrm{N}\mathrm{a}$ , respectively, the elements that release more energy upon an electron gain are

<p><span class="mathml" contenteditable="false"> <math> <mi mathvariant="normal">C</mi> <mi mathvariant="normal">l</mi> <mo>&gt;</mo> <mi mathvariant="normal">F</mi> </math> </span> (exception)</p><p><span class="mathml" contenteditable="false"> <math> <mi mathvariant="normal">S</mi> <mo>&gt;</mo> </math> </span>Se (size effect)</p><p><span class="mathml" contenteditable="false"> <math> <mi mathvariant="normal">L</mi> <mi mathvariant="normal">i</mi> <mo>&gt;</mo> <mi mathvariant="normal">N</mi> <mi mathvariant="normal">a</mi> </math> </span> (size effect)</p>

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