a) Lustrous: Metals have shining surfaces. So they are called Lustrous. Whereas non-metals have dull surface so they are non Lustrous. One of the form of carbon is diamond has most shining look. Iodine a non-metal also has lustrous surface.
b) Malleability: Metals can be beaten into sheets and non-metals cannot be beaten into sheets. But mercury is a metal which breaks into pieces when hammered.
c) Ductility: Metals are drawn into wires. Non-metals cannot be drawn into wires. Mercury does not show ductility.
d) Conductivity: Metals are good conductors of heat and electricity and non-metals are bad conductors of electricity and heat. Graphite is a nonmetal which is good conductor of heat and electricity.
e) Hardness: Metals are usually hard and non-metals are soft. But sodium and potassium are quite soft, they can be cut by using a knife. Diamond is a non-metal which is the hardest substance.
