The set that contains atomic numbers of only transition elements, is :
Show Hint
- 21, 32, 53, 64
- 9, 17, 34, 38
- 37, 42, 50, 64
- 21, 25, 42, 72
The Correct Option is D
Solution and Explanation
(1) 21 = Sc (d-block), 32 = Ge (p-block), 53 = I (p-block), 64 = Gd (f-block). Not all transition elements.
(2) 9 = F, 17 = Cl, 34 = Se, 38 = Sr. None is a d-block element.
(3) 37 = Rb (s-block), 42 = Mo, 50 = Sn (p-block), 64 = Gd. Not all transition elements.
(4) 21 = Sc (3d), 25 = Mn (3d), 42 = Mo (4d), 72 = Hf (5d). All are d-block transition elements.
Answer: (4) 21, 25, 42, 72
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