Compounds

• Group seven elements


  Also called the halogens
• Group seven elements


  • Have seven electrons in their outer energy level
• Group seven elements forming molecules

  Two atoms joined by a covalent bond
• Covalent compound


  Formed when group seven elements react with other non-metal elements
• Ionic compound


  Formed when halogens react with metals
• Halogen reacting with metal


  1. Halogen gains one electron from metal atom

  2. Halogen forms ion with negative one charge
• Group seven ions


  • Fluoride
  • Chloride
  • Bromide
  • Iodide
• The name of the halogen ends with 'ide' when it forms an ion