1.

Which of the following electronic configuration would you expect to have the highest second ionization enthalpy :

Answer»

`1S^(2) 2S^(2) 2P^(6) 3s^(2)`
`1s^(2) 2s^(2) 2p^(6) 3s^(1)`
`1s^(2) 2s^(2) 2p^(6)3s^(2) 3p^(4)`
`1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(5)`

ANSWER :B


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