Question
Which one will have the highest 2nd ionisation energy?
Options :
1s² 2s² 2p⁶ 3s¹
1s² 2s² 2p⁴
1s² 2s² 2p⁶
1s² 2s² 2p⁶ 3s²
Answer :
1s² 2s² 2p⁶ 3s¹
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