chemistry timeline important people

By cheeco
  • Joseph Proust

    law of definite proportions
  • John Dalton

    discovers atoms
  • J. L. Gay-Lussac

    the gas volume will increase as the temperature rises as long as the mass and pressure of the gases are kept consistent
  • Amadeo Avagadro

    gases are made up of atoms and can be accounted for
  • JJ Thompson

    electron discovery
    plumb pudding model
    isotopes- chemically similar, but different in mass
    2 kinds of neon
  • Max Planck

    introduced hypothesis that oscellating atoms absorb and emit energy
  • Robert Millikan

    measured charge on single atom
    oil-drop experiment
  • Lord Rutherford

    charge of electron is negative

    photoelectric effect
  • Niels Bohr

    found out that atoms have 2 states, excited and ground
  • Max Born

    definition of quantity of heat
  • Louis de Broglie

    electron waves theory
  • Erwin Schrodinger

    atoms organized through electric clouds instead of power level
  • Werner Heisenberg

    uncertainty principle
  • Walter Bothe

    momentum and energy are conserved at atomic level
    cosmic rays consist of massive particles
  • Wolfgang Pauli

    energy and momentum lost when electron is expelled from the nucleus
  • James Chadwick

    discovered neutron