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Why do halogens have high electron gain ...

Why do halogens have high electron gain enthalpies (i.e. `-Delta_(eg)H^(o.))`?

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The valence sheel electronic configuration of halogens is `ns^(2)np^(5)` and thus they require one electron to acquire the stable noble gas configuration `ns^(2)np^(5)`. Because of this they have strong tendency to accept an additional electron and hence have high electron gain enthalpies.
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