Which of the following statements is incorrect for pair of elements Zr - Hf ?

Both possess same number of valence electrons

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Both have identical atomic sizes

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Both have almost identical ionic radii

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Both of these belong to same period of periodic table

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Solution

The correct option is D Both of these belong to same period of periodic table
The statement (D), "Both of these belong to same period of periodic table" is incorrect statement.

The correct statement is, "Zr belongs to the fifth period and Hf belongs to the sixth period".

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