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Amongst the elements with following electronic configurations, which one of them may have the highest ionization energy?

1. Ne [3s23p1]
2. Ar [3d104s24p3]
3. Ne [3s23p3]
4. Ne [3s23p3]

Correct answer: Ne [3s23p3]

Solution

Ne [3s23p3] has a half-filled p-orbital, which is more stable, requiring more energy to remove an electron.

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