Which of the following possesses the highest second ionisation energy?

CHEMISTRY · Single correct · CBSE · Chemistry · Classification of Elements and Periodicity in Properties · Classification of Elements and Periodicity in Properties

Problem

Which of the following possesses the highest second ionisation energy? (1) 1s2 2s2 2p6 3s21s^2\,2s^2\,2p^6\,3s^2 (2) 1s2 2s2 2p6 3s11s^2\,2s^2\,2p^6\,3s^1 (3) 1s2 2s2 2p31s^2\,2s^2\,2p^3 (4) 1s2 2s2 2p41s^2\,2s^2\,2p^4

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