Course info

Halogens

 Elements of Group VII in the Periodic Table are called the halogens.  The name “halogen” is derived from Greek words that mean “salt former.” At room temperature, the halogens exist in physical phases that vary from gas to solid.

 The halogens combine directly with hydrogen, forming hydrogen halides, all of which are colorless gases

 Because of their oxidizing power, halogens make superb disinfectants for water treatment.

 Disinfection is the treatment process used to destroy or inactuate disease-causing (pathogenic) organisms.

 Disinfection should not be confused with sterilization.  Sterilization is the destruction of all living microorganisms.

This lesson will also cover:

• Properties of chlorine
• Sources of Ammonia
• Reactions
• THM
• Breakpoint Chlorination