At 30 degrees Celsius (86 degrees Fahrenheit), the following elements are liquids:

* Bromine (Br)

Let me explain why the others are not liquids at this temperature:

* Mercury (Hg) is a liquid at room temperature (around 20 degrees Celsius), but it freezes at -38.83 degrees Celsius.

* All other elements are either solids or gases at 30 degrees Celsius.

Remember, the state of matter (solid, liquid, or gas) is determined by the temperature and pressure.