Nonmetals Form Only Anions, Never Monatomic Cations
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Nonmetals never form monatomic cations under ordinary conditions, since high ionization energy makes electron loss unfavorable, so every monatomic nonmetal ion is an anion.
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Chlorine forms the chloride anion Cl− readily, but never a monatomic Cl+ cation.
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A nonmetal can still carry a positive oxidation state in a covalent compound — the restriction is on forming a true monatomic cation.
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