Which one of the following elements has the highest ionization energy.

1.	Which one of the following elements has the highest ionization energy.
Answer» `[He] 3s^(2) 3p^(1)` `[He] 3s^(2) 3p^(2)` `[He] 3s^(2) 3p^(3)` `[AR] 3d^(10) 4s^(2) 4p^(2)` Answer :C

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