1.

Assertion. Cu, Ag and Au lie in Group IIof the periodic table. Hence, their atomci radii are in the order Cu lt Ag lt Au Reason . In any groupof transition elements,the atomicradii increaseas we move down the group.

Answer»

Solution :Correct A. The atomic RADII are in the order `:`
`CU lt AG ~= AU`.
Correct R. Ag and Au have same atomic radii due to the EFFECT of lanthanoide contraction.


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