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Periodic table (Group 7 (VII) (trends (physical (colour darkens down the…

- - - - colour darkens down the group
      - mp/bp increases down the group
      - state of halogen changes gas to solid down the group as a result
    - - reactivity with sodium decreases down the group opposite
      - more reactive halogen displace less reactive from it's halide - displacement reaction
      - halides - salts formed when halogens react with sodium
- - - - +1 electron
  - - - valency electrons determine their properties
- - - - density increases down the group
      - all heavier than air except helium, neon
    - - colourless non metals
      - monatomic