Q.
Which is the correct order of electron affinity ?
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a
Li > Mg > Na
b
Na < Li < Mg
c
Li < Na < Mg
d
Li > Na > Mg
answer is D.
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Detailed Solution
In general E.A decreases down the group and increases across a period. But E.A of Na > Mg(3s2) due to stable completely filled configuration of ‘Mg’Li > Na > Mg = Be
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