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Question
Give an example of three elements exhibiting variable valency.
Answer in Brief
Solution
Few examples of elements exhibiting variable valency:
- Iron (Fe) can show a valency of 2 and 3.
- Copper (Cu) can show a valency of 1 and 2.
- Phosphorus (P) can show a valency of 3 and 5.
| Monovalent | Divalent | Trivalent | Tetravalent | |
| Copper | `"Cu"^(1+)` | `"Cu"^(2+)` | ||
| Iron | `"Fe"^(2+)` | `"Fe"^(3+)` | ||
| Lead | `"Pb"^(2+)` | `"Pb"^4+` |
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