group 7 elements

• what is another name for group 7 elements?


  halogens
• what are halogens?


  all non-metals with coloured vapours
• what are example of halogens and there coloured vapour?

  • fluorine - poisonous yellow gas
  • chlorine - poisonous dense green gas
  • bromine - poisonous red-brown volatile liquid
  • iodine - dark grey crystalline solid or purple vapour
• what happens as you go down the group 7 elements?

  • less reactivity
  • higher melting point and boiling points
  • higher relative atomic masses
• what can halogens form?

  molecular compounds by sharing electrons with another element

  ionic bonds by gaining 1 electron
• what will more reactive halogens do to less reactive ones?


  displace them in a reaction