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Why are the electron affinities of alkal...

Why are the electron affinities of alkaline earth metals nearly zero?

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Alkaline earth metals have stable `ns^2` configuration & are reluctant to accept electrons. Thus, their electron affinity values are nearly zero. These are metallic by nature and highly electropositive also, that is, they as it is have a poor tendency to accept electrons. The negative anions of group-2 metals are not known.
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