Which of the following has the lowest ionization energy ?

Oxygen

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Nitrogen

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Fluroine

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Sulphur

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Solution

The correct option is B Sulphur
Consider the given options. Sulphur has the maximum atomic radius when compared to the other three atoms. Also the electronic configuration of sulphur is $[N e] 3 s^{2} 3 p^{4}$ . By losing one electron, sulphur can attain the half filled state and hence achieve greater stability. Hence, sulphur has the least ionization enthalpy in this case.

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