halogens

• fluorine 


  yellow gas
• chlorine 


  green gas
• bromine 


  brown liquid
• iodine 


  grey solid
• boiling point 


  increases down the group

  ionic radi increases so induced dipole increases

  therefore more energy needed
• electronegativity 


  decreases down the group
• are oxidising agents
• halogen activity decreases down the group
• litmus paper will turn red then colourless in chlorine water
• halide ions are reducing agents
• chloride ion 


  in silver nitrate produces white precipitate

  in dilute ammonia solution it is soluble

  in concentrated ammonia solution it is soluble
• bromide ion 


  in silver nitrate produces cream precipitate

  in dilute ammonia solution it is insoluble

  in concentrated ammonia solution it is soluble
• iodide ion 


  in silver nitrate produces yellow precipitate

  in dilute ammonia solution it is insoluble

  in concentrated ammonia solution it is insoluble