Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?

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Al < Ca < O < C < F

Al < O < C < Ca < F

C < F < O

answer is D.

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Detailed Solution

Electron gain enthalpy becomes less negative from top of bottom in a group while it becomes more negative from left to right within a period.

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