Q. Which of the following is a non metal that remains liquid at room temperature?

Explanation by: Bhakti Bliss

Bromine is a non-metal that remains in a liquid state at room temperature (around 20°C or 68°F).
Phosphorus: Exists as a solid at room temperature (white phosphorus is solid).
Chlorine: Exists as a gas at room temperature.
Helium: Exists as a gas at room temperature, and it only becomes a liquid at extremely low temperatures.
So, Bromine is the only non-metal that remains liquid at room temperature.