Because of lanthanoidcontraction, which of the following pairs of elem – InterviewSolution

1.	Because of lanthanoidcontraction, which of the following pairs of elements have nearly same atomic radii ? ( Numbers in parenthesis are atomic numbers )
Answer» Zr(40) and Hf (72) Zr(40) and Ta ( 73) Ti(22 ) and Zr (40) Zr(40)and Nb(41) Solution :Zr( 40) andHf ( 72) LIE in the same group and Hf comes after La. Hence, Zr and Hf have NEARLY same SIZE due to lanthanoidcontraction.

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