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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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