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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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The correct answer is:
Ca < Al < C < O < F
Electron gain enthalpy becomes less negative from top to bottom in a group while it becomes more negative from left to right within a period.
Ca < Al < C < O < F
Ca < Al < C < O < F
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