There are 92 elements occurring naturally, out of which 70 are metals and about 22 are non- metals some elements show properties of both metals and non-metals they are called metalloids
Metals are solid, hard, malleable and ductile
Metals have high melting and boiling points and are good conductor of heat and electricity.
Non-metals may be solid, liquid or gas, and are not malleable and ductile.
CBSE Revision Notes 