Halogens
- Created by: Tasnim 'Kazehaya' Chan
- Created on: 19-12-12 19:45
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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
- Increase positive shield
- 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-
- Displacement reactions
- increase solubility in water
- Volatility increases
- Increase oxidising strength
- Polar
- Doesn't dissolve in non-polar
- Does dissolve in polar
- e.g. Water
- down the group
- Halide ions
- React with silver ions
- Silver precipitate formed
- Chloride - White
- Bromide - cream
- Iodine - yellow
- Silver precipitate formed
- Ag+ (aq) + X- (aq) --> AgX(s)
- Ionic equation to represent reaction
- React with silver ions
- Displacement reactions
- any halide displaces halide below it
- Works as oxidising agent
- Takes electron from another element/ compound
- Takes electron from another element/ compound
- P-block
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