1.

Which of the following statements is INCORRECT for pair of elements Zr-Hf?A. Both possess same number of valence electrons.B. Both have identcial atomic sizes.C. Both have almost identical ionic radii.D. Both of these belong to same period of periodic table.

Answer» Correct Answer - D
These are chemical twins
Zr belongs to 5th period and 4th group.
Hf belongs to 6th period and 4th group.


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