The Periodic Table

C3 Unit 1

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  • Created by: Tabba
  • Created on: 20-06-13 11:37
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  • The Periodic Table
    • the modern periodic table
      • the new discovered elements were added to the gaps that mendeleev had left
      • you can deduce the number of protons neutrons and electrons
      • you can deduce thenumber of elcectron shells
      • you can deduce the number of outer shell electrons
      • you can deduce the properties of some elements
    • group 7 - the halogens
      • When they react with metals they form ionic compounds containing halide ions
      • The charge on a halide ion is 1-
      • The trend in melting and boiling points is that they increase as you go down the group
      • They become less reactive as you go down
    • the early periodic table
      • newland
        • arrabged the elements by atomis mass
        • noticed every 8th element had similar properties
        • no room for new elements
        • two elements in the same place
        • metals + non-metals got mixed up
    • group 1 - alkaline metals
      • Have low density - so they float on water
      • When they react with non-metals they form 1+ ions
      • They are white crystalised solids that dissolve and become colourless in water
      • When they react with water they form metal hydroxide and hydrogen - they fizz float and catch fire
      • Hyrdroxide dissolves in water to form hydroxide ions
    • transition metals
      • Found between groups 2 and 3
      • E.g Copper, Iron, Mercury and Gold
      • High melting point compared to group 1 metals
      • Stronger and harder compared to group 1 metals
      • Can form ions with different charges
      • Can form coloured compounds
      • They are useful catalysts


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