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Which of the following gives the electron gain enthalpies (in kJ/mol) of fluorine, chlorine, bromine and iodine in that order?

1. −296, −325, −333 and −349
2. −349, −333, −325 and −296
3. −333, −349, −325 and −296
4. −333, −325, −349 and −296

Correct answer: −333, −349, −325 and −296

Solution

The correct option reflects the trend in electron gain enthalpy values, which generally become less negative down the group in the halogens due to increasing atomic size and decreasing effective nuclear charge, making it easier for larger atoms to accommodate an additional electron.

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