The electron affinities of the elements from aluminum to chlorine are -44, -120, -74, -200.4, and -384.7 kJ/mol, respectivelyRationalize the trend in these values.
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the electron configurations of these elements are filling the p shell of the elementfrom p1 to p5 filling the half shell stabilizes nitrogen - p3 which makes a half filled shell has the lowest electron affinitythat is why the p5 element (Cl) has the highest electron affinity, otherwise the electron affinity rises as you go across the row fully filling the p shell is a much stronger energy benefit than filling the half shellthat is why the last two affinities are so much larger than the first three.
