Practice question
Question
Which element has the smallest ionic radius among the following cations?
Explanation
For isoelectronic cations (Li+, Be²⁺, B³⁺, C⁴⁺, all with 2 electrons), radius decreases with increasing nuclear charge. B³⁺ (Z=5) is smaller than Li+ (Z=3), Be²⁺ (Z=4), and C⁴⁺ (Z=6).
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