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Halogens and Noble gases

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Halogens and Noble gases

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Halogens and Noble gases

  1. 1. Noble Gases
  2. 2. Uses & Applications <ul><li>Helium </li></ul><ul><li>filling balloons </li></ul><ul><li>inert gas shield </li></ul><ul><li>cooling medium for nuclear reactors </li></ul>
  3. 3. Uses & Applications <ul><li>Neon </li></ul><ul><li>neon advertising signs </li></ul><ul><li>gas lasers </li></ul><ul><li>economical cryogenic refrigerant </li></ul>
  4. 4. Uses & Applications <ul><li>Argon </li></ul><ul><li>in electric light bulbs & fluorescent lamps </li></ul><ul><li>inert gas shield </li></ul>
  5. 5. Uses & Applications <ul><li>Krypton </li></ul><ul><li>in fluorescent lamps </li></ul><ul><li>in flash lamps </li></ul>
  6. 6. Uses & Applications <ul><li>Xenon </li></ul><ul><li>electronic flash guns </li></ul><ul><li>electron tubes </li></ul>
  7. 7. Uses & Applications <ul><li>Radon </li></ul><ul><li>natural radioactive source </li></ul><ul><li>self-luminous paint </li></ul>
  8. 8. The Periodic Table: Halogens
  9. 9. What are they ?
  10. 10. Characteristics <ul><li>metals or non-metals? </li></ul><ul><li>reactive or non-reactive? </li></ul><ul><li>number of valence electrons? </li></ul><ul><li>exist as diatomic molecules </li></ul><ul><li>extreme right of the </li></ul><ul><li>Periodic Table </li></ul>7
  11. 12. Fluorine <ul><li>gas (r.t.p.) </li></ul><ul><li>pale yellow in colour </li></ul><ul><li>melting point : -220 ̊ C </li></ul><ul><li>boiling point : -188 ̊ C </li></ul>
  12. 13. Chlorine <ul><li>gas (r.t.p.) </li></ul><ul><li>yellowish green in colour </li></ul><ul><li>melting point : -101 ̊ C </li></ul><ul><li>boiling point : -35 ̊ C </li></ul>
  13. 14. Bromine <ul><li>liquid (r.t.p.) </li></ul><ul><li>reddish-brown in </li></ul><ul><li>colour </li></ul><ul><li>melting point : -7 ̊ C </li></ul><ul><li>boiling point : +59 ̊ C </li></ul>
  14. 15. Iodine <ul><li>solid (r.t.p.) </li></ul><ul><li>shiny black in colour </li></ul><ul><li>melting point : +114 ̊ C </li></ul><ul><li>boiling point : +184 ̊ C </li></ul>
  15. 16. Putting them into a TABLE...
  16. 17. Table Form Do you notice any trends?? Solid +184 +114 Shiny Black Iodine Liquid +59 -7 Red-Brown Bromine Gas -35 -101 Yellowish Green Chlorine Gas -188 -220 Pale Yellow Fluorine State (r.t.p.) Boiling Point ( ̊ C) Melting Point ( ̊ C) Colour Name
  17. 18. Trends Fluorine Chlorine Bromine Iodine Colour darkens ; M.P. and B.P. increases Reactivity increases
  18. 19. Reactivity <ul><li>How do we know which is more reactive? </li></ul>Halogen Displacement Reactions

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