Which of the following configurations would you expect to have the lowest ionization energy.
a) 1s²2s²2p⁶.
b) 1s²2s²2p⁵.
c) 1s²2s²2p⁶3s^1.

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Solution

Here, the lowest ionization energy will be for the third configuration i.e. 1s²2s²2p⁶ 3s¹ ,as the outermost orbital (3s) has only one electron which can be easily removed in low energy requirements and so its I.E is least.

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