Which of the following configurations represent atoms of elements having the highest second ionisation energy?

Which of the following configurations represent atoms of elements havi

1.	Which of the following configurations represent atoms of elements having the highest second ionisation energy?
Answer» `1S^(2) 2s^(2) 2p^(4)` `1s^(2) 2s^(2) 2p^(6)` `1s^(2) 2s^(2) 2p^(6) 3S^(1)` `1s^(2) 2s^(2) 2p^(6) 3s^(2)` Answer :c