Halogens

• which halogens are gas at room temp?


  Flourine, Chlorine
• which elemts are solids?

  Iodine, Astatine
• Which is liquid?

  Bromine
• what colour is astatine?

  black
• what colour is iodine?

  dark grey?
• what colour vapour does iodine form whn warmed?

  purple
• What colour is bromine?

  red-brown
• what colour is chlorine?

  yellow-green
• what colour is flourine?

  pale yellow
• does M.p& B.p increase/decrease going down group?

  increase
• what happens to reactivity going down group?

  reactivity decreases
• why does m.p & b.p increase going down group?

  intermolecular forces between molecules increases meaning more energy is needed to overcome these forces
• low/high B.p?

  low
• why low boiling points?


  forces of attraction between molecules are weak
• poor conductors of?

  heat and elctricity
• what group?

  7
• halogens react with metals to produce what compound?


  metal halides
• why does reactivity decrease going down group?

  outer shell is further from nucleus so there is more sheilding by electrons there force of attraction is weaker as it becomes harder to gain an electron
• what will a more reactive halogen do to a less reactive halogen?

  displace it from its compound
• how many electrons on outer shell?


  7