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Scientist timline

Mrs rose rm 108

19-20

16-18

10-12

7-9

13-15

1-3

4-6

Democritus

  • contributed during 400 BC
  • He devoloped atomic theory

Aristotle

  • Contributed during 355 BC
  • inveted the field of formal logic

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Henry Cavendish

  • Contributed in 1766
  • First person to analye atmespheric air

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Antoine Lavoisier

  • Contributed in 1783
  • Devoloped system for chemical substances

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John Dalton

  • He contributed in 1803
  • He introduced atomic theory

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Amedo Avogadro

  • 1811
  • He made hypothesis saying that equal number of gasses and molecules

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Dmitri Mendeleev

  • He contributed on 1869
  • Determined the electron structures of atoms

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Wilhelm Rontgen

  • contributed in 1895
  • Invented x rays

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J. J. Thomson

  • He contributed in 1997
  • He discovered the electrons

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Antoine Becquerel

  • He contributed in 1896
  • discovered radio activity

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Fritz Haber

  • He contributed in 1918
  • Made methods to make amonia and nitrogen

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Marie Curie

  • He contributed in 1898
  • He discovered radium

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Robert Millikan

  • He contributed in 1910
  • He precisley determined magnitutude of electron charge

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Niels Bohr

  • He contributed in 1993
  • He developed the bohr model of a atom

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Ernest Rutherford

  • He contributed in 1919
  • Postulated the structore of a atom

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Enrico Fermi

  • He contributed in 1926
  • Built the first nuclear reactor

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Friedrich Hund

  • He contributed in 1927
  • Determined structers of atoms

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James Chadwick

  • He contributed in 1932
  • Proved existence of neutrons

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Erwin Schrodinger

  • He contributed in 1926
  • Formulated a wave equation

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Lloyd Quarterman

  • He contributed in 1930
  • He isolated isotopes

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