A) \[Mn\] and W
B) \[Mo\] and \[Tc\]
C) \[Fe\] and \[Co\]
D) \[Hf\] and \[Zr\]
Correct Answer: D
Solution :
\[Zr\] and Hf possesses similar atomic size and hence are called twins of periodic table. It is due to lanthanide contraction.
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