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Q.

In which of the following pairs, size of 1st element is higher when compare to 2nd element?

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a

Cu,Ag

b

Sc,Zn

c

Sc,La

d

Hf,La

answer is A.

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Detailed Solution

Both Scandium, Sc (Z = 21) and Zinc, Zn atomic number Z =30 belong to same period (4th ) and 3d block. Size of an element decreases from left to right in a same period. Hence, Zn has larger size than Sc.

rzn>rSc

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