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Discovery of the Periodic Table

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Discovery of the Periodic Table
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  • Johann Wolfgang Dobereiner
  • I have found some groups of elements which have showed similar properties. I shall call them Dobereiner's Triads. The atomic mass of the middle element is the mean of the other two elements.
  • 1829
  • 1865
  • I will increase these 56 elements by increasing atomic mass. I have found that every eight element had properties similar to the first. This is just like the octaves in music, so therefore, I will name is Newland's Ocataves This law only works up till calcium.
  • John Newlands
  • Dmitri Mendeleev
  • I have examined the relationship between the atomic masses of each element and their physical and chemical properties. I believe that the atomic mass of an element is the most important property in classyfying the elements.
  • 1869
  • Dmitri Mendeleev
  • I have arranged the elements in increasing order according to their atomic mass and properties. My law states that the physical and chemical properties of elements are a periodic function of their atomic masses, making the Mendeleev Periodic Table
  • 1869
  • 1913
  • I have discovered that the atomic number is now the most important property of classifying the periodic table. The law is now, the chemical and physical properties of elements are a periodic function of their atomic number, now making the Modern Periodic Table.
  • Henry Moseley
  • THEEND
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