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Question

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

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

The correct option is C a significant decrease from O2 to Al3+
As we move along a period, size decreases, and as we move down the group size increases so here
Zelectron
Na+1110
Mg2+12 10
Al+31310
F910
O2 8 10
Above are isoelectronic species, hence size 1Z
So size decreases from O2 to Al+3.
Option D is correct.

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