Which of the following elements has the highest ionisation energy

1.	Which of the following elements has the highest ionisation energy
Answer» `[Ne] 3s^(2) 3p^(1)` `[Ne]3s^(2) 3p^(2)` `[Ne] 3s^(2) 3p^(3)` `[Ar] 3d^(10) 4S^(2) 4P^(2)` SOLUTION :Since `E^(-)` is to be removed from exactly half filled p-orbital.

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