The set that contains atomic numbers of only transition elements, is:
d & f-Block Elements · Class 12 · JEE Main Previous Year Question
The set that contains atomic numbers of only transition elements, is:
- a
37, 42, 50, 64
- b✓
21, 25, 42, 72
- c
9, 17, 34, 38
- d
21, 32, 53, 64
21, 25, 42, 72
Transition elements have partially filled d-orbitals in ground state or in common ionic states.
Checking Option (2): 21, 25, 42, 72
| Z | Element | Config | Transition? | |---|---------|--------|-------------| | 21 | Sc | [Ar] | Yes ✓ | | 25 | Mn | [Ar] | Yes ✓ | | 42 | Mo | [Kr] | Yes ✓ | | 72 | Hf | [Xe] | Yes ✓ |
Why others fail:
- 37 (Rb): s-block; 50 (Sn): p-block; 64 (Gd): f-block (lanthanoid)
- 9 (F), 17 (Cl): p-block halogens; 34 (Se): p-block; 38 (Sr): s-block
- 32 (Ge): p-block; 53 (I): p-block halogen
Answer: Option (2) — 21, 25, 42, 72
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