The element which shows only one oxidation state other than its elemental form is:

Question

Canvas Classes · Accepted Answer

Concept: Variable Oxidation States

| Element | Config | Oxidation States |
|---------|--------|------------------|
| Co (Z=27) | [Ar]  | +2, +3 |
| Ti (Z=22) | [Ar]  | +2, +3, +4 |
| Ni (Z=28) | [Ar]  | +2, +3 |
| Sc (Z=21) | [Ar]  | +3 only |

Sc loses all 3 electrons to achieve the stable  noble gas configuration. It cannot show any other positive oxidation state. Hence it shows only +3 — a single oxidation state other than 0.

Answer: Option (4) — Scandium

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