In which list are the elements arranged in order of increasing first ionization energy ?

Li, Na, K

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S, O, F

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Na, Mg, Al

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F, Ne, Na

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Solution

The correct option is B S, O, F
Along the period IE increases and down the group IE decreases. Hence, the correct order will be $S > O > F$ . But, $M g$ as higher IE than $A l$ due to stable fully filled s orbital of magnesium.

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