The periodic table

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  • The periodic table
    • The early periodic table
      • John Dalton
        • Arranged in order of mases
      • Mendeleev
        • Ordered with the elements' atomic weights
    • The modern periodic table
      • Arrange elements in order of their atomic (proton) number
      • Reactivity
        • Group 1- INCREASES
          • Going DOWN the group
        • Group 7- DECREASES
          • Going DOWN the group
    • Group 1- Alkali metals
      • Properties
        • Very reactive
        • Stored in oil-prevents them reacting with oxygen in air
        • Very low density
        • Soft
      • Melt and boil
        • low temps
    • Transition elements (metals)
      • properties
        • physical
          • good conductors of electricity and energy
          • Hard and strong
          • High densities
          • High melting points
        • Chemical
          • less reactive than metals in group 1
          • Corrode slowly
    • group 7-halogens
      • Untitled

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