Non-Metallic Elements

Properties of non-metals are almost opposite to those of those of metals.Some non- metals are found in free state but some exit as compounds in combination with other elements.Non-metals do not have a luster.They are not ductile nor malleable.Most non-metals are brittle.Non metals are weak conductors of heat and electricity.Yet graphite which is a non-metal is a good conductor of electricity.Densities of non metals are  comparatively low,yet diamond has an extremely high density.

Chemical Properties

• Non-metals form negative ions.

• Non metals combine with oxygen to form  oxides which are acidic.these are often gases.They dissolve easily in water to form acids.

                             C(s) + O₂(g) -------> CO₂(g)

                             CO₂(g) + H₂O(l) ------> H₂CO₃ (aq)

Nitrogen                     Sulphur                      Carbon