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Question

The ions O2,F,Na+,Mg2+ and Al3+ are isoelecronic. Their ionic radii show:

A
a significant increase from O2 to Al3+
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B
a significant decrease from O2 to Al3+
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C
an increase from O2 to F and then decrease from Na+ to Al3+
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D
an decrease from O2 to F and then increase from Na+ to Al3+
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Solution

The correct option is A a significant decrease from O2 to Al3+
As all the given species are iso electronic, the ionic radii decreases with increasing atomic number as effective nuclear charge increases. Hence from O2 to Al3+, the size decreases significantly i.e., option B.

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