1.

Which of the following pairs of elements have almost similar atomic radii ?A. `Zr, Hf`B. `Cu, Ag`C. `Sc, Ti`D. `Pd, Pt`

Answer» Correct Answer - A
Due to consequence of lanthanide contraction
Size of `Zr =` size of `Hf`
Size of `Nb=` size of `Ta`
Size of `Mo=` size of `W`
Size of `Co=` size of `Ni` (due to imperfect screening effect of `3d` orbitals) `|{:("Group" .rArr,4,5,6,),("Period" rArr 5,Zr,Nb,Mo,),("Period" rArr 6,Hf,Ta,W,):}|`


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