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Zirconium (Zr, Atomic number 40) and Haf...

Zirconium (Zr, Atomic number 40) and Hafnium (Hf, Atomic number 72) are transition series metals of group 4. They are found together in nature and are difficult to separate from each other.
Which of the following is the reason for the above?

A

The almost identical radii of the atoms.

B

The elements belong to the same group.

C

The elements belong to adjacent periods.

D

The presence of the same number of unpaired electrons in both the elements.

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