Chem Project

  • 450


    B.C.- Came up with the idea that atoms can not be split.
  • 450


    450 B.C.-Unlike his buddy Democritus, Aristotle did not believe an atom existed, but the true idea came around 2000 years later.
  • Period: 450 to

    History of the Atomic Theory

  • Antoine Lavoisier

    Antoine Lavoisier
    Founded the law of conservation of matter. He also states that there are 3 states of aggregation. Matter cannot be created or destroyed.
  • Joseph Proust

    Joseph Proust
    Came up with the idea that atoms have different weights. (Protons, Neutrons, Electrons)
  • John Dalton

    John Dalton
    founded law of Multiple Proportions. Atoms have different ratios to combine to form mixtures. Society did not accept his beliefs for a while longer.
  • J.J. Thomson

    J.J. Thomson
    Discovered atoms have negative charges called electron. One of the main compunds of the modern atomic structure.
  • Robert Millikan

    Robert Millikan
    Discovered the value for a negative charge through the oildrop experiment. He also helped discovered with J.J. Thomson that electrons are negative.
  • Niels Bohr

    Niels Bohr
    Theory that atom was 1/10000 the size of other scientists atoms. Atoms are TINY, and act like orbit like planets.
  • Ernest Rutherford

    Ernest Rutherford
    Proved that an atom has a nucleus and that is surrounded by negative electrons. Discovered basic atomic structure.