9.1 Hydrogen, Oxygen, Water and Ozone 9.1 Hydrogen, oxygen and Ozone 9.4 Nitrogen 9.5 Halogens 9.6 Carbons 9.7 Phosphorus 9.8 Sulphur 10.1 Metals and Metallurgy 10.2 Alkali metals 10.3 Alkaline earth metals 11 Bioinorganic Chemistry