MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryPeriodic PropertiesAtomic and Ionic Radii

The ions O₂–, F–, Na⁺, Mg2+and Al3+are isoelectronic. Their ionic radii show

A.an increase from O₂– to F– and then decrease from

B.a decrease from O₂– to F– and then increase from

C.a significant increase from O₂– to Al³⁺

D.a significant decrease from O₂– to Al³⁺✓ 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. Hence, the correct order of the ionic radius is 2 2 3 O F Na Mg Al . Therefore, the ionic radius exhibits a significant decrease 2 3 O to Al .

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