Atomic and physical properties . . .
Discusses trends in atomic radius, electronegativity, electron affinity and melting and boiling points of the Group 7 elements. It also looks at the bond strengths of halogen-halogen bonds and of hydrogen-halogen bonds.
Halogens as oxidising agents . . .
Describes and explains the trend in oxidising ability of the Group 7 elements based on the reactions between one halogen and the ions of another one - for example, between Cl2 and I- ions from salts like KI.
More reactions of halogens . . .
The reactions of halogens with hydrogen, phosphorus, sodium, iron, iron(II) ions, and sodium hydroxide solution.
The acidity of the hydrogen halides . . .
Discusses the acidity of the hydrogen halides (like hydrogen chloride), and explains why HF is a weak acid.
Halide ions as reducing agents . . .
Describes and explains the trend in reducing ability of the halide ions based on their reactions with concentrated sulphuric acid.
Testing for halide ions . . .
Describes and explains the tests for halide ions using silver nitrate solution followed by ammonia solution.
The manufacture of chlorine . . .
Describes the manufacture of chlorine by the electrolysis of sodium chloride solution using a diaphragm cell and a membrane cell.