Name one metal and one non-met-al that exist in liquid state at room temperature. Also name two metals having melting point less than 310 K (`37^(@)C`).

Explanation

**Step-by-Step Solution:**

1. **Identify a metal that exists in liquid state at room temperature:**
- The metal that is liquid at room temperature is **Mercury**.
- **Symbol:** Hg

2. **Identify a non-metal that exists in liquid state at room temperature:**
- The non-metal that is liquid at room temperature is **Bromine**.
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