1.

which of the following configurations represents atoms of the elements having the higest second ionisation energy?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» Correct Answer - C
Because for removing second electrons, it has to be taken out from stable configuration that needs a large amount of energy.


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