Even formula of compound KOH,NH3 , …

Based on the properties, elements have been divided into two; Metals and Non- Metals. They have an important part in our daily life. Both metals and non-metals are useful in different ways. There is a large number of metals and non-metals in the world. Metals are elements that can conduct electricity and are malleable and ductile. They are hard and shining in nature. Examples are iron, aluminium, copper, silver and gold. It is widely used in our daily life for a large number of purposes. It is used for making cooking utensils, buses, cars, etc. Non-metals are good conductors of electricity. They are neither malleable nor ductile and are also brittle. Examples are carbon, sulphur phosphorus, etc. Carbon has two allotropes, diamond and graphite. Diamond is used as jewellery and graphite is used in pencil leads. All metals and non-metals have similar properties. But, the properties of non-metals are opposite those of metals. This chapter deals with the properties, reactivities and basic examples of metals and non-metals.