Out of the $114$ elements discovered so far,how many elements do not behave as metals?

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
$(i)$ Good thermal conductivity
$(ii)$ Good electrical conductivity
$(iii)$ Ductility
$(iv)$ High melting point

Name two metals which have very low melting points.

Give reasons: Platinum,gold,and silver are used to make jewellery.

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 $310\ K$ $(37\ ^\circ C)$.

Generally,non-metals are not lustrous. Which of the following non-metal is lustrous?