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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