All metals are solids.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Statement**: The statement claims that "All metals are solids." We need to evaluate whether this statement is true or false.

2. **General Characteristics of Metals**: Metals are generally known to be hard, lustrous (shiny), sonorous (they produce a deep sound when struck), and good conductors of heat and electricity. Most metals are indeed solid at room temperature.

3. **Identifying Exceptions**: While most metals are solid, there are exceptions. The most notable exceptions are:
- **Mercury (Hg)**: This metal is liquid at room temperature and is commonly used in thermometers.
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