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Why is fluorine's electron gain enthalpy less negative than chlorine's?
AChlorine has fewer total electrons
BRepulsion in the small n = 2 shell
CFluorine has lower nuclear charge
DFluorine is a metallic element
Answer & Solution
Correct answer: B. Repulsion in the small n = 2 shell
The added electron in fluorine enters the compact 2p level and is repelled strongly, while chlorine's 3p is roomier.
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