group 7 - halogens

• Group 7

  Halogens
• Halogens

  • Reactivity
  • Observations
• Chlorine

  Halogen
• Bromine

  Halogen
• Iodine

  Halogen
• Displacement

  Reaction where one element takes the place of another element in a compound
• the elements in this group are fluorine, chlorine, bromine, iodine and astatine
• all members of the halogen family have seven electrons in their outer shell
• halogens exist as

  The halogens exist as molecules made of pairs of atoms joined by a covalent bond. (Remember that halogens also form ionic bonds with metals such as those found in group 1.)
• why does reactivity go down as you go down group 7

  As you move down the periodic table, the atoms increase in size and the outer shell’s electrons get further away from the attractive force of the positive nucleus. This makes it harder to attract and gain an extra electron.