Metals:
1. Metals have a lustre.
2. They are generally good conductors of heat and electricity.
3. They are generally solids at room temperature.
Exception: Mercury and gallium are liquids.
4. Metals form basic oxides.
Nonmetals:
1. Nonmetals have no lustre.
Exception: Iodine and Diamond.
2. They are bad conductors of heat and electricity.
Exception: Graphite.
3. They are generally gases and solids at room temperature.
Exception: Bromine is a liquid.
4. Nonmetals form acidic or neutral oxides.
