Problem: The electron affinities of the following 4th row elements have the following values: K + e - →  K -1       EA = -48 kJ/moles Ca + e - →  Ca -1   EA = -4 kJ/moles  Ga + e - →  Ga -1   EA = -30 kJ/moles From the standpoint of the electron configuration of the atoms, explain this trend, in particular, why Ca is a small exothermic value.

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The electron affinities of the following 4th row elements have the following values:

K + e - →  K -1       EA = -48 kJ/moles

Ca + e - →  Ca -1   EA = -4 kJ/moles 

Ga + e - →  Ga -1   EA = -30 kJ/moles

From the standpoint of the electron configuration of the atoms, explain this trend, in particular, why Ca is a small exothermic value.