Group 7 Elements

• The Halogens


  • Fluorine
  • Chlorine
  • Bromine
  • Iodine
  • Astatine
• The Halogens


  • Form molecules that contain hazardous compounds
  • Become less reactive as you go down the group
  • Have higher melting and boiling points as you go down the group
  • Have higher reactivity as you go down the group
• The halogens all have seven electrons in their outer shell
• Covalent bonds


  Bonds formed when halogens react with other non-metals by sharing electrons
• Halides


  Compounds formed when halogens bond with metals (e.g. fluoride, chloride, bromide, iodide)
• Displacement reactions


  1. More reactive halogen replaces less reactive halogen in a compound

  2. Halogen changes from a halide ion to a halogen

  3. Less reactive halogen changes from a halogen to a halide ion
• As you go down Group 7

  The elements become less reactive
• As you go down Group 7

  The elements have higher melting and boiling points
• As you go down Group 7

  The elements have more electrons in the outer shell
• As you go down Group 7


  The elements have stronger intermolecular forces
• Neon has a higher boiling point than helium
• Xenon has a boiling point in between argon and radon