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CGP EDU Academic Team
Published on: August 13, 2026
The correct order of size of ions Li + , Mg 2+ , K + , Al 3+ :
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Verified by ExpertsThe correct answer is:
A
K + has more number of shells than Mg 2+ and AI 3+ . AI 3+ and Mg 2+ are isoelectronic but AI 3+ has higher nuclear charge, so AI 3+ < Mg 2+ . Mg 2+ and Li + have diagonal relationship. But due to +2 charge in Mg 2+ , the Mg 2+ is smaller than Li + . Hence Al 3+ is the smallest one.
K + = 1.38 Å, Li 2+ = 0.76 Å, Mg 2+ = 0.72 Å and Al 3+ = 0.535 Å.
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