Early Periodic Table

The creation of the periodic table

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  • Early Periodic Table
    • John Dalton
      • ordered in mass measured in many chemical reactions
      • 1808_ first suggestion
    • John Newlannds
      • John Dalton
        • ordered in mass measured in many chemical reactions
        • 1808_ first suggestion
      • Law of Octaves
        • Based on observations that every 8th element had similar properties
      • Thought all elements had been found
        • So scientists ridiculed the idea as not all elements fitted his pattern
        • Left no gaps for undiscovered elements though new ones were turning up all the time
    • Dmitri Mendeleev 1869
      • Only 50 elements had been found
      • Order of atomic mass
      • Periodic pattern in their physical properties and chemical properties could be seen
      • Left gaps for undiscovered elements
        • predicted their properties from his table
    • Compared to the modern periodic table
      • no transition elements
        • Only 50 elements had been found
      • now they are ordered by atomic number
  • Compared to the modern periodic table
    • no transition elements
      • now they are ordered by atomic number

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