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

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Sc,Zn

Sc,La

Cu,Ag

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.

$r_{zn} > r_{Sc}$

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