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Question

The set representing the correct order of ionic radii is:

A
Li+>Be2+>Na+>Mg2+
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B
Na+>Li+>Mg2+>Be2+
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C
Li2+>Na+>Mg2+>Be2+
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D
Mg2+>Be2+>Li+>Na+
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Solution

The correct option is B Na+>Li+>Mg2+>Be2+
The ionic radius in general increases on moving from top to bottom in a group and decreases on moving from left to right in a period.
Hence, correct order is
Na+0.95˚A>Li+0.68˚A>Mg2+0.65˚A>Be2+0.63˚A

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