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Which element's ionic radius is smaller than its atomic radius? a) oxygen b) nitrogen c) calcium
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Which element's ionic radius is smaller than its atomic radius? a) oxygen b) nitrogen c) calcium

User Ebi
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Calcium, because when it becomes an ion, it loses two electrons and gets rid of its M shell, decreasing its ionic radius. The rest are anions, which increase in ionic radius because the effective nuclear charge decreases.
User Timothy Vogel
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