There are about 118 elements, 107 of which are naturally occurring. Metals and non-metals are characterized by distinctly different physical and chemical properties. At present about 80 metals are known to us. Metals can be shaped like clay, are heat-resistant, and are not fragile.
Though the non-metals are only 22 in number, they are the major constituents of earth, air and oceans. At room temperature, over half of the non-metals are gases, except bromine, which is a liquid. The most abundant non-metal in the earth's crust is oxygen, which constitutes about 50% of the earth's crust and along with nitrogen it forms the main constituents of air. The next abundant non metal is silicon which constitutes about 26% of the earths crust. Oxygen and silicon are the two major constituents of earth. Hydrogen and oxygen are the two major constituents of the oceans.
Position of Metals and Non-metals in the Periodic Table
COMPARATIVE PROPERTIES OF METALS AND NON-METALS