The Periodic Table

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  • the periodic table
    • the history
      • newlands law of octaves
        • every eighth  element had similar properties
        • pattern broke down after the third row
      • mendeleev
        • left gaps unlike newlands
          • predicted properties of future elements
      • relative atomic mass
        • whatboth newlands   and  mendeleev ordered elements by
    • modern periodic table
      • now based on electronic structure
      • scientists now accept its importance
    • group 1
      • alkali metals
        • reactivity increases
          • outer electron becomes further away from nucleus - more shielded - less attraction - easier to lose
        • form 1+ ions
        • melting point decreases
        • reaction with water produces hydrogen - produce white compounds which dissolve to form colourless solutions
    • group 7
      • the halogens
        • reactivity decreases
          • outer electron becomes further away from nucleus - more shielded - less attraction - harder to gain
        • melting point increases
        • 1- charge
        • coloured vapours - exist as paired molecules - more reactive halogens will displace less reactive ones
    • transition  elements
      • good conductors
      • often have more than one ion eg Fe2+ and Fe3+
      • compounds are v colourful
      • t.e and their compounds are good catalysts

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