Name two metals that can exhibit variable valency .Also give the names of redicals.

Explanation

**Step-by-Step Solution:**

1. **Understanding Variable Valency:**
- Valency refers to the ability of an element to combine with other elements, which is often indicated by the charge it acquires when forming compounds. Some metals can exhibit more than one valency, meaning they can form ions with different charges.

2. **Identifying Metals with Variable Valency:**
- Two common metals that exhibit variable valency are:
- **Copper (Cu)**:
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