JEE MAIN - Chemistry (2020 - 7th January Evening Slot - No. 5)
Within each pair of elements F & Cl, S & Se, and Li & Na, respectively, the elements that release
more energy upon and electron gain are :
F, S and Li
Cl, Se and Na
Cl, S and Li
F, Se and Na
Explanation
Electron affinity of second period p-block
element is less than third period p-block element
due to small size of second period p-block element.
$$ \therefore $$ Electron affinity order : F $$<$$ Cl
Down the group electron affinity decreases due to size increases.
$$ \therefore $$ Electron affinity E.A. order : S $$>$$ Se
Li $$>$$ Na
$$ \therefore $$ Electron affinity order : F $$<$$ Cl
Down the group electron affinity decreases due to size increases.
$$ \therefore $$ Electron affinity E.A. order : S $$>$$ Se
Li $$>$$ Na
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