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Question

The electron affinities of the alkaline earth metals positive. If true enter 1, else enter 0.

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Solution

$M (g) + e^{-} \to M^{-} (g)$
The extra electron must eneter np-subshell, which is effectively shielding the two ns-electrons and the inner electrons. Consequently, the alkaline earth metals have little tendency to pick up an extra electron.And hence electron affinities of the alkaline earth metals positive

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