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JEE Main Chemistry question

ChemistryClassification of Elements and Periodicity in PropertiesJEE Main

Consider the ions and . The radii of these ionic species follow the order [Kerala CEE 2004]

Answer: (D)

Solution

and are all isoelectronic with argon (18 electrons), so radius decreases as nuclear charge increases: S (Z=16) < Cl (Z=17) < K (Z=19) < Ca (Z=20). This gives the

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Question ID VK-133159