Halogens

The Chemistry of the Halogens - Covers their properties, methods of preparation, general trends, the hydrogen halides, and oxyacids of the halogens and their salts.
chemed.chem.purdue.edu/genchem/topicreview/bp/ch10/group7.php

Doc Brown's Chemistry Clinic: The Halogens - Includes an overview, general properties, reactivity trends, and information about the industrial electrolysis of sodium chloride solution.
www.wpbschoolhouse.btinternet.co.uk/page03/The_Halogens.htm

Visual Elements: The Halogens - Overview, general properties, and chemical data for the group.
www.chemsoc.org/viselements/pages/data/intro_groupvii_data.html