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Which of the following pairs of elements...

Which of the following pairs of elements have almost similar atomic radii ?

A

`Zr, Hf`

B

`Cu, Ag`

C

`Sc, Ti`

D

`Pd, Pt`

Text Solution

Verified by Experts

The correct Answer is:
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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