Periodic Table Group 7 (Halogens) Menu
Note: If you use the current IUPAC (international Union of Pure and Applied Chemistry) system for group numbering, you will probably know what I call Group 7 as Group 17.
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.
Halide ions as reducing agents
Describes and explains the trend in reducing ability of the halide ions based on their reactions with concentrated sulfuric 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.