Ionization enthalpy of Cl is greater than F. Why?
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Fluorine, though higher than chlorine in the periodic table, has a very small atomic size.
This makes the fluoride anion so formed unstable (highly reactive) due
to a very high charge/mass ratio. Also, fluorine has no d-orbitals,
which limits its atomic size. As a result, fluorine has an electron
affinity less than that of chlorine.
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