The Periodic Table

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The Periodic Table
- Groups
  - Group I - Alkali metals - very reactive metals
  - Group II - Alkaline earth metals - reactive metals
  - Group VII - Halogens - reactive nonmetals
  - Group 0 - Noble gases - unreactive non-metals
- Groups
  - The Noble Gases
    - Colourless and Odourless gases.
    - Densities increase going down the group
    - Melting and boiling points increase going down the group.
    - Full outer shell
  - Halogens
    - They are poisonous
    - Exist as diatomic molecules
    - Melting and boiling points increase down the group
    - State and Colour at room temperature
      - Fluorine - pale yellow gas
      - Chlorine - pale green gas
      - Iodine - Dark grey solid sublimes on heating to give purple vapour
- History of the periodic table
  - Newlands
    - Law of Octaves
    - Arranged by atomic mass
    - Didn't leave gaps for undiscovered elements.
    - Placed two elements into one position
    - Mixed up metals and non-metals
  - Mendeleev
    - Arranged by atomic mass
    - Arranged into Periods and Groups
    - Left gaps for undiscovered elements.
    - Predicted properties of missing elements
They are easily cut with a knife exposing a shiny surface. This shiny surface quickly tarnishes, becomes dull again.

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