Which one will have the highest 2nd ionisation energy?

Which one will have the highest 2nd ionisation energy?

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Q. Which one will have the highest 2nd ionisation energy?

A.            1s2 2s2 2p6 3s1

B.            1s2 2s2 2p4

C.            1s2 2s2 2p6

D.            1s2 2s2 2p6 3s2

Answer: 1s2 2s2 2p6 3s1

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