Group 7 - Halogens

• As you go down group 7, reactivity decreases, as the nucleus is further away and so the forces of attraction are weaker
• The Halogens react with Alkali Metals to form salts

  Sodium + Chlorine -> Sodium Chloride

  2Na + Cl2 -> 2NaCl
• A more reactive Halogen can displace a less reactive one. This is known as a displacement reaction