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

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

(1) 37, 42, 50, 64

(2) 21, 32, 53, 64

(3) 21, 25, 42, 72

(4) 9, 17, 34, 38

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(3) 21, 25, 42, 72

Explanation:

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.

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