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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 ^6 `

B

`1s^2 2s 2p ^5`

C

`1s^2 2s^2 2p^3`

D

`1s^2 2s^22p ^5 3s ^(1)`

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The correct Answer is:
D
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