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C3.02 Trends in groups - Coggle Diagram

- - - - They are stored in oil to prevent them reacting with the oxygen and water vapour in the air
    - - The melting points become lower while the density of of the metals increases
    - - The reactions range from vigorous in the case of lithium to explosive in the case of caesium
- - - - They form negative ions carrying a single charge, Cl- Br-
  - - - Chlorine water includes
        
        Hydrochloric acid
        
        Hypochlorous acid
        
        Hypochlorous acid can give up its oxygen to other substances
        
        Chlorine water acts as an oxidising agent
    - - Chlorine is more reactive than bromine and iodine
        
        Chlorine replaces bromine and iodine and metal chloride is formed
- - - - Helium has the lowest melting point of any element and cannot be solidified by cooling alone
  - - - The atoms do not combine with each other
- - - - They have excellent corrosion resistance