JEE Main Chemistry question

The set representing the correct order of ionic radius is [AIEEE 2009]

(A)Li^+ > Be^{2+} > Na^+ > Mg^{2+}
(B)Na^+ > Li^+ > Mg^{2+} > Be^{2+}Correct
(C)Li^{2+} > Na^+ > Mg^{2+} > Be^{2+}
(D)Mg^{2+} > Be^{2+} > Li^+ > Na^+

Answer: (B)

Solution

Within each period, a +1 cation is larger than a +2 cation of the same period (greater charge pulls the electron cloud in more); across periods, period-3 ions are larger than the corresponding period-2 ions of the same charge type. This gives $≈0.95 Å) >

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Question ID VK-133190