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Q.

Which one of the following is the correct order of the size of the ions?

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a

Na+>Mg2+>F−>O2−

b

O2−>F−>Na+>Mg2+

c

Mg2+>Na+>F−>O2−

d

O2−>F−>Mg2+>Na+

answer is B.

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Detailed Solution

For isoelectronic species, Ionic radius ∝1 atomic number Thus, the correct order will be 8O2−>9F−>11Na+>12Mg2+
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