Chlorine is a non-metal. Metals are good conductors of heat and electricity, and are malleable. Non-metals are (usually) poor conductors of heat and electricity, and are not malleable or ductile; many of the elemental non-metals are gases at room temperature.
Chlorine usually accepts electrons so is an oxidant, thus it shows the property of a non-metal. The element chlorine is a yellowish-green gas which is extremely reactive and react with various metals.