Discussion
The element that has the highest first ionization potential is.......
Answer: D
Nitrogen has the highest first ionisation potential of the four.
Ionisation energy rises across a period, so oxygen should exceed nitrogen - but nitrogen's \(2p^3\) sub-shell is exactly half filled and therefore unusually stable, while oxygen's \(2p^4\) has one paired orbital whose electron–electron repulsion makes removal easier. So the order is N > O > C > B.
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