JEE Main Chemistry question

The size of ionic species is correctly given in the order

(A)Cl^{7+} > Si^{4+} > Mg^{2+} > Na^+
(B)Na^+ > Mg^{2+} > Si^{4+} > Cl^{7+}Correct
(C)Na^+ > Mg^{2+} > Cl^{7+} > Si^{4+}
(D)Cl^{7+} > Na^+ > Mg^{2+} > Si^{4+}

Answer: (B)

Solution

, , and are all isoelectronic (10 electrons each), with nuclear charge increasing in the order Na(11) < Mg(12) < Si(14) < Cl(17). Since a higher nuclear charge pulls the same number of electrons in

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Question ID VK-133467