MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryPeriodic PropertiesPrevious Year Questions

The correct order of the decreasing ionic radii among the following isoelectronic species is (CBSE AIPMT 2010)

A.K+>Ca2+>Cl–> S2–

B.Ca2+> K+> S2–>Cl–

C.Cl–> S2–>Ca2+> K+

D.S2–>Cl–> K+>Ca2+✓ Correct

Explanation

Isoelectronic species are the species that have the same number of electrons. In isoelectronic species, the greater the nuclear charge or atomic number the smaller will be the ionic radius. Therefore, the correct order of the ionic radius is- 2 1 2 S Cl K Ca .

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