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Which of the following has the hihest el...

Which of the following has the hihest electron gain enthalpy. Give reasons.
(a) `[Ne]3s^(2)3p^(3)` (b) `[Ne]3s^(2)3p^(4)`
( c) `[Ne]3s^(2)3p^(5)` , (d) `[Ne]3s^(2)3p^(6)`

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