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MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryPeriodic PropertiesAtomic and Ionic Radii

Identify the correct order of the size of the following

A.Ca²⁺< K⁺<Ar< S₂–<Cl–

B.Ca²⁺< K⁺<Ar<Cl–< S₂–✓ Correct

C.Ar<Ca²⁺< K⁺<Cl–< S₂–

D.Ca²⁺<Ar< K⁺<Cl–< S₂–

Explanation

Isoelectronic species are the species that have the same number of electrons. In isoelectronic species, PERIODIC PROPERTIES 35 the greater the nuclear charge or atomic number the smaller will be the ionic radius. Hence, the correct order of the ionic radius is + 2 + 2 Ca < K < Ar < Cl < S . Therefore, the correct option is b.

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