Which of the following electronic config...

Which of the following electronic configuration of an atom has the lowest ionisation enthalpy?

A

`1s^2,2s^22p^3`

B

`1s^22s^22p^6,3s^1`

C

`1s^2,2s^22p^6`

D

`1s^2,2s^22p^5`

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The correct Answer is:

B

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