Consider the halogens: Fluorine (), Chlorine (), Bromine (), and Iodine (). According to standard ex — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

The absolute magnitudes of the electron gain enthalpies (electron affinities) for the halogens are: $Cl \approx 349 \text{ kJ/mol}$, $F \approx 328 \text{ kJ/mol}$, $Br \approx 325 \text{ kJ/mol}$, and $I \approx 295 \text{ kJ/mol}$. The elements with an electron affinity strictly greater than $300 \text{ kJ/mol}$ are $F$, $Cl$, and $Br$. The total is 3.