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Why do Beryllium and nitrogen have zero ...

Why do Beryllium and nitrogen have zero electron affinity ?

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(i) Beryllium-`1s^2,2s^2`
Nitrogen `(1s^2,2s^2,2p^3)`
The addition of extra electron will disturb their stable electronic configuration( completely filled & half filled) and they have almost zero electron affinity.
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