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Question

Which of the following have the largest ionic size?

A
F
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B
O2
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C
Na+
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D
Mg2+
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Solution

The correct option is A O2
All species are isoelectronic. They have 10 electrons.

O2 has a least nuclear charge ( due to lowest atomic number) and hence has the largest ionic size as few positive charges are attracting more negative charges.

The correct order of ionic size:
O2>F>Na+>Mg2+

Hence, option B is correct.

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