What does ∆H represent in the following equation ? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1

What does ∆H represent in the following equation ? Cl_(g) + e- → CI- _(g); ∆H = - 363 kJ mol-¹

A lonization energy
B Electron affinity
C Dissociation energy
D Heat of atomization

waec 2001 chemistry

The correct answer is B. Electron affinity

No explanation given

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