The ions O^ 2- , F^-, Na^+, Mg^ 2+ and Al^ 3+ are isoelectronic. Their ionic radii show [Pb. CET 2010]

JEE Main Chemistry question

The ions and are isoelectronic. Their ionic radii show [Pb. CET 2010]

(A)A decrease from to and then increase from to
(B)A significant increase from to
(C)A significant decrease from to Correct
(D)An increase from to and then decrease from to

Answer: (C)

Solution

For isoelectronic species, ionic radius is inversely related to nuclear charge; as nuclear charge steadily rises from O (Z=8) through F, Na, Mg, to Al (Z=13), the radius steadily and significantly falls: $ > > >

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Question ID VK-133198