Give some differences with examples between metals and non-metals with reference to their physical properties. Give one exception in each case. 

Exception: carbon as diamond is a non-metal but has a most shining look. Iodine is another non-metal which gives shining crystalsException: mercury is a liquid metal at room temperature and not malleable . Exception: mercury is a metal but not ductileException: graphite is a non-metal but is a good conductor of heat and electricityException: metals like sodium or potassium are quite soft and can be easily with a knife. Diamond (a form of non-metal carbon) is the hardest substance know to human.

• Metallic Luster: metals have a shining surface called metallic luster. Non metals have dull appearance. Metals like silver, gold have shining appearance. Non-metal like sulphur has dull appearance
• Malleability: metals are malleable. They can be beaten into sheets. But non-metals cannot be beaten into sheets. They break into pieces when hammered. They are not malleable. Metals like gold, aluminium, copper etc. form sheets when hammered
• Ductility: metals are ductile. They can be drawn into wires. Non-metals cannot drawn into wires
• Conductivity: metals are good conductors of heat and electricity while non-metal are bad conductors of heat and electricity
• Hardness: metals are usually hard while non-metals are brittle and can be easy broken into pieces or converted into powder