Name a halogen, a metal and a group13 element which are liquid at `30^@C`.

Answer

To answer the question, we need to identify three specific types of elements that are liquid at 30°C: a halogen, a metal, and a Group 13 element.

### Step-by-Step Solution:

1. **Identify a Halogen:**
- The halogens are located in Group 17 of the periodic table. The halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
- Among these, bromine (Br) is the only halogen that is liquid at room temperature (around 30°C).

**Answer: Bromine (Br)**

2. **Identify a Metal:**
- Metals are generally solid at room temperature, but there are exceptions. The most notable exception is mercury (Hg), which is liquid at room temperature.
- Mercury is known for its unique property of being a liquid metal.

**Answer: Mercury (Hg)**

3. **Identify a Group 13 Element:**
- Group 13 elements include boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).
- Among these, gallium (Ga) is known to be a solid at room temperature but can melt at slightly above room temperature, making it liquid at around 30°C.

**Answer: Gallium (Ga)**

### Final Answers:
- Halogen: **Bromine (Br)**
- Metal: **Mercury (Hg)**
- Group 13 Element: **Gallium (Ga)**