Nonmetals

Halogens

Chlorine bleaches colours and kills bacteria

Fluorine, bromine and iodine compared with chlorine

Oxygen and sulfur

About 21 % of the air is oxygen

From sulfur to sulfuric acid

Nitrogen and phosphorus

Turning nitrogen from the air into ammonia

Why does a match light when it is struck?

Carbon and silicon

Diamond is hard and graphite is soft, yet both are carbon

The silicon in sand becomes a semiconductor

Noble gases

The noble gases hardly react