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The set that contains atomic numbers of only transition elements, is

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21, 25, 42, 72

37,42,50,64

9, 17, 34, 38

21,32,53,64

answer is C.

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Detailed Solution

A transition element is defined as the one which has incompletely filled d orbitals in its ground state or in any one of the oxidation state $Zn (z = 30), Cd (z = 48), Hg (z = 80)$ are not transition element.

Transition elements = 21 to 30

37 to 48

57 & 72 to 80

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