ALLOY:
Alloy is the mixture of metal with metal or metal with non-metal.
There are about 7000 alloys which are used for different purposes in the world.
Example: Brass is an alloy of Copper (Cu) and Zinc (Zn). Steel is an alloy of iron and carbon. Alloy can be prepared by mixing elements in different proportions. In alloy it become difficult for layers of metal atoms to slide over each other. So alloy is harder and stronger than pure metal.
