Group 7 elements

• Flourine- very reactive, poisonous yellow gas

  Chlorine - fairly reactive, poisonous dense green gas

  Bromine - A dense, poisonous red-brown liquid

  Iodine - dark grey solid or purple Vapour
• Trends:

  As you go down the halogens:

  • Become less reactive because its harder to gain an extra election because the outer shell becomes further away from the nucleus
  • Higher melting and boiling points
  • Higher relative atomic mass
• Halogens can share electrons through Covalent bonding. The compounds formed by halogens all have Simple molecular structures
• Halogens form ionic bonds with metals

  1 ) Halogens form 1- ions called halides

  2) The compounds that form have ionic structures