Group VII - The Halogens

As you go down group 7 the halogens become...
1. 1) Less reactive
2. 2) Higher melting point
3. 3) Higher boiling point
Halogens are all non metals with coloured vapours...
1. Fluorine - very reactive, poisonous yellow gas
2. Chlorine - fairly reactive, poisonous dense green gas
3. Bromine - dense, poisonous red-brown volatile liquid
4. Iodine - dark grey crystalline solid/purple vapour
All form molecules which are pairs of atoms
1. F2
  1. F
  2. F
2. Cl2
  1. Cl
  2. Cl
3. Br2
  1. Br
  2. Br
4. I2
  1. I
  2. I
Do both Ionic and covalent bonding
1. Form I- ions when they bond with metals
2. Form covalent bonds with non-metals to form molecules like these....
  1. C
    1. Cl
    2. Cl
    3. Cl
    4. Cl
    5. Carbon tetrachloride (CCl4)
  2. Cl
    1. H
    2. Hydrogen Chloride (HCl)
React with metals to form salts
1. React with most metals, including iron and aluminium to form salts or 'metal halides'
More reactive halogens will displace less reactive ones
1. Chlorine can displace bromine and iodine from a solution of bromide or iodine
2. Bromine will also displace iodine because of the trend in reactivity

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