With which of the following electronic c...

With which of the following electronic configuration of an atom has the lowest ionization enthalpy:

A

`1s^(2) 2s^(2) 2p^(3)`

B

`1s^(2) 2s^(2) 2p^(6) 3s^(1)`

C

`1s^(2) 2s^(2) 2p^(6)`

D

` 1s^(2) 2s^(2) 2p^(5)`

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The correct Answer is:

B

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