Similarity in the radius of Zr and Hf is explained on the basis of

Lanthanide Contraction

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Inert pair effect

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Anomalous Configuration

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Samevalency configuration

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Solution

The correct option is A Lanthanide Contraction
Due to Lanthanide Contraction, size of 5d series ‘Hf’ decreases and becomes equal to the 4d series ‘Zr’.

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