Name one metal and one non-metal that exist in liquid state at room temperature. Also,name two metals having a melting point less than $310\ K$ $(37\ ^\circ C)$.

(N/A) The metal that exists in a liquid state at room temperature is Mercury $(Hg)$.
The non-metal that exists in a liquid state at room temperature is Bromine $(Br)$.
Two metals that have a melting point less than $310\ K$ $(37\ ^\circ C)$ are Cesium $(Cs)$ and Gallium $(Ga)$.