Assertion: Cu, Ag and Au lie in Group 11 of the periodic table. Hence their atomic radii are in the order `CultAgltAu`
Reason: In any group iof the transition elements, the atomic radii increase as we move down the group.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If (A) is incorrect but (R) is correct.

Answer

d

Explanation

Correct A: The atomic radii are in the order `CultAg=Au`.
Correct R: Ag and Au have same atomic radii due to the effect of lanthanide contraction.