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In which one of the following pairs, the radius of the second species is greater than that of the first.

$ (a)\;O^{2-},N^{3-} \\(b)\; Na,Mg \\ (c)\;Al,Be \\ (d)\;Li^{+},Be^{2+}$
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The correct pair is $O^{2-},N^{3-}$
Hence a is the correct answer.
answered Mar 7, 2014 by meena.p

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