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AP Chemistry
1.7 Periodic Trends
IntermediateMCQConceptual15.3k
The enthalpy changes for the addition of an electron to gaseous fluorine and chlorine atoms are shown in the table below.

ElementProcess\(\Delta H^\circ\text{ (kJ/mol)}\)
\(\text{F}\)\(\text{F}(g) + e^- \rightarrow \text{F}^-(g)\)\(-328\)
\(\text{Cl}\)\(\text{Cl}(g) + e^- \rightarrow \text{Cl}^-(g)\)\(-349\)

Which of the following statements best explains why the addition of an electron to \(\text{F}(g)\) releases less energy than the addition of an electron to \(\text{Cl}(g)\)?

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