MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryPeriodic PropertiesAtomic and Ionic Radii

Which of the following order is correct for the size of Fe³⁺, Fe, and Fe²⁺?

A.Fe < Fe²⁺< Fe³⁺

B.Fe²⁺< Fe³⁺< Fe

C.Fe < Fe³⁺< Fe²⁺

D.Fe³⁺< Fe²⁺< Fe✓ Correct

Explanation

A decrease in the number of electrons for the same number of protons increases the effective nuclear charge on the outermost electrons. The higher the effective nuclear charge, the smaller will be the ionic size. Therefore, the correct order of size is + 3 + 2 Fe 63pm < Fe 77pm < Fe 126pm .

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