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 .

Back to Question Bank

Practice More Like This

Take chapter-wise tests, track your progress, and master Periodic Properties.

Start Free Practice →