which of the following configurations represents atoms of the elements having the higest second ionisation energy?

Options

A. `1s^(2)2s^(2)2p^(4)`
B. `1s^(2)2s^(2)2p^(6)`
C. `1s^(2)2s^(2)2p^(6)3s^(1)`
D. `1s^(2)2s^(2)2p^(6)3s^(2)`

Answer

C

Explanation

Because for removing second electrons, it has to be taken out from stable configuration that needs a large amount of energy.