Test Academy | Which one will have the highest 2nd ionisation energy? 1s² 2s² 2p⁶ 3s¹, 1s² 2s² 2p⁴, 1s² 2s² 2p⁶, 1s² 2s² 2p⁶ 3s²

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

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