Halogens

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  • Halogens
    • P-block
      • 7 electrons outer shell
      • Group 7
    • Properties
      • down the group
        • reactivity decreases
        • Size of atom increases
          • Increase positive shield
            • Hard to gain electron
        • Melting/  boiling point increases
      • up the group
        • Increase oxidising strength
          • Displacement reactions
            • any halide displaces halide below it
            • Works as oxidising agent
              • X2 + 2e- --> 2X-
              • Takes electron from another element/ compound
                • X2 + 2e- --> 2X-
        • increase solubility in water
        • Volatility increases
      • Polar
        • Doesn't dissolve in non-polar
        • Does dissolve in polar
          • e.g. Water
    • Halide ions
      • React with silver ions
        • Silver precipitate formed
          • Chloride - White
          • Bromide  - cream
          • Iodine - yellow
      • Ag+ (aq) + X- (aq) --> AgX(s)
        • Ionic equation to represent reaction
    • Displacement reactions
      • any halide displaces halide below it
      • Works as oxidising agent
        • Takes electron from another element/ compound

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