The set that contains atomic numbers of only transition elements, is : (A) 37, 42, 50, 64 (B) 21, 32, 53, 64 (C) 21, 25, 42, 72 (D) 9, 17, 34, 38

Question

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

(A) 37, 42, 50, 64
(B) 21, 32, 53, 64
(C) 21, 25, 42, 72
(D) 9, 17, 34, 38

Prashant Kotian · Accepted Answer

Correct answer: C. 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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