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Of the given electronic configurations for the elements, which electronic configuration indicates that there will be abnormally high difference in the second and third ionization energy for the element?

1. 1s22s22p63s2
2. 1s22s22p63p1
3. 1s22s22p63s23p6
4. 1s22s22p63s23p2

Correct answer: 1s22s22p63s2

Solution

The configuration 1s22s22p63s2 corresponds to a group 2 element (alkaline earth metal). After losing two electrons, it attains a noble gas configuration, making the third ionization energy abnormally high due to the removal of an electron from a stable, fully filled shell.

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