Which is the correct order of electron affinity ?

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Li > Mg > Na

Na < Li < Mg

Li < Na < Mg

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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