The properties of elements and the structure of their atoms; the electronic theory of valency and the periodic classification; oxidation, reduction and electrochemical processes; the principles governing the extraction of elements; the extraction and use of typical elements; the extracts and uses of transition and associated metals; industrial alloys; commercial processes based on air, water, petroleum and coal; the industrial production of sulphuric acid; chemicals from salt - the alkali industry; crystallization and the crystalline state; hydrogen, the hydrides and water; oxygen; oxides and peroxides; group I - the alkali metals; group II - the alkaline-earth metals; group III - the baron group; group IV - the carbon group; group V - the nitrogen group; group VI - sulphur; group VII - the halogens; period 4 - transition and associated elements; period 5 - silver; period 6 - mercury.