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

Answer is B

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