Differences between metals and non-metals

 When a metal reacts with a non-metal, the metal gives up electrons and the non-metal takes them.

On a macro scale : Metals have ductility (may be drawn into wire), malleability (may be hammered or rolled into shape) and a metallic luster, have high melting points, high density and are good conductors of heat and electricity.

Key difference : Metals are solid at room temperature, highly conductive of heat and electricity and are malleable and ductile in nature. Non-metals can be solid, liquid or gaseous at room temperature, and are not conductive, malleable or ductile.