Which of the following is the lightest metal?

Options

A. Mercury
B. Silver
C. Lithium
D. Lead

Explanation

To determine which of the following is the lightest metal among mercury, silver, lithium, and lead, we will compare their atomic weights.

### Step-by-Step Solution:

1. **Identify the Metals and Their Atomic Weights**:
- **Mercury (Hg)**: Atomic weight = 200.6 u
- **Silver (Ag)**: Atomic weight = 108 u
- **Lithium (Li)**: Atomic weight = 6.94 u
- **Lead (Pb)**: Atomic weight = 207.2 u

2. **List the Atomic Weights**:
- Mercury: 200.6 u
- Silver: 108 u
- Lithium: 6.94 u
- Lead: 207.2 u

3. **Compare the Atomic Weights**:
- Now we will compare the atomic weights to find the lightest metal.
- Among the listed atomic weights:
- Mercury: 200.6 u
- Silver: 108 u
- Lithium: 6.94 u
- Lead: 207.2 u

4. **Determine the Lightest Metal**:
- The lowest atomic weight is that of lithium, which is 6.94 u.
- Therefore, lithium is the lightest metal among the options provided.

5. **Conclusion**:
- The lightest metal among mercury, silver, lithium, and lead is **Lithium**.

### Final Answer:
- The lightest metal is **Lithium**.

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