Question

why do elements like beryllium , magnesium and nitrogen have positive electron affinity? Pls. no spam

Answer 1

Answer:

Electron gain enthalpies of Be and Mg are positive because of the following reasons: ... They have fully filled s orbitals and addition of new electron would move to the higher energy p . 3. This addition of new electron is very energetically unfavorable and so this accounts for the more positive electron affinity.

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Answer 2

Answer:

Notice that the Group 2 elements have much lower electron affinities than the Group 1 elements, with beryllium and magnesium even having positive electron affinities. ... Because of electron-electron repulsions, this is energetically unfavorable, making the electron affinity more positive.

Explanation: