Question:medium

Which of the following orders is not correct for the given property?

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Always watch out for the "N vs O" and "Be vs B" traps in Ionisation Enthalpy! Half-filled and full-filled configurations jump ahead of the next element in the period.

Updated On: May 12, 2026

$ \text{Li} < \text{Na} < \text{K} $ -- metallic radius
$ \text{Br} < \text{F} < \text{Cl} $ -- electron gain enthalpy
$ \text{C} < \text{N} < \text{O} $ -- first ionisation enthalpy
$ \text{Mg}^{+2} < \text{Na}^{+} < \text{F}^{-} $ -- ionic radius

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The Correct Option is C

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