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Which among the following pairs of eleme...

Which among the following pairs of elements is 'not' an example of chemical twins ?

A

Zr and Hf

B

Nb and Ta

C

Mo and W

D

Ta and Re

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The correct Answer is:
D
a pair of elements having similar properties due to similar atomic radii are called chemical twins and they are elements of 4d and 5d - series because they have large difference in their atomic radii while all other elements have almost similar atomic radii.
Zr (145 Pm) and Hf (144Pm)
Nb (134 Pm) and Ta(134 Pm)
Mo (129 Pm) and W (130 Pm)
Ta (134 Pm) ad Re (114 Pm).
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