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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?

1. Ca < Al < C < O < F
2. Al < Ca < O < C < F
3. Al < O < C < Ca < F
4. C < F < O < Al < Ca

Correct answer: Ca < Al < C < O < F

Solution

Electron gain enthalpy becomes more negative as we move across a period and less negative down a group. Fluorine has the most negative value, followed by oxygen, carbon, aluminum, and calcium.

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