Atom Timeline

By 22kutnerjo
  • 460 BCE

    Democritus Birth

  • Democritus Atom Model
    410 BCE

    Democritus Atom Model

    Thought of the theory that all things are made of atoms.
    Believed atoms were indivisible.
  • 370 BCE

    Democritus Death

  • John Dalton Birth

  • John Dalton Atom Model

    John Dalton Atom Model

    Elements are composed of atoms.
    Atoms of the same elements are identical
    Atoms of different elements combine in simple whole-number ratios to form chemical combined.
    Chemical reactions, atoms are combined, separated, or rearranged-but never changed.

  • Dmitri Mendeleev Birth

  • John Dalton Death

  • Eugene Goldstein Birth

  • J.J Thomson Birth

  • Max Planck Birth

  • Robert Millikan Birth

  • Ernest Rutherford Birth

  • Dmitri Mendeleev Atom Model

    Dmitri Mendeleev Atom Model

    Created the first Periodic Table

  • Niels Bohr Birth

  • Erwin Schrodinger Birth

  • J.J Thomson Atom Model

    J.J Thomson Atom Model

    Discovered the electron and its negative charge.

  • James Chadwick Birth

  • Werner Heisenberg Birth

  • Ernest Rutherford Atom Model

    Ernest Rutherford Atom Model

    Added the nucleus to the atom.
    "Most of the particles passed through.
    a few particles were deflected.
    very Few were greatly deflected."

  • Dmitri Mendeleev Death

  • Max Planck Atom Model

    Max Planck Atom Model

    The originator of the quantum theory.
  • James Chadwick Atom Model

    James Chadwick Atom Model

    Introduced the idea of sub-energy levels.
    Discovered the neutron by comparing electric charges and masses of different atoms.
    The neutron is found in the nucleus.
  • Eugene Goldstein Atom Model

    Eugene Goldstein Atom Model

    Discovered the proton and learned about their positive charge.

  • Eugene Goldstein Death

  • Erwin Schrodinger Atom Model

    Erwin Schrodinger Atom Model

    Used mathematical equations to describe the likelihood of finding an electron in a certain place.

  • Ernest Rutherford Death

  • Robert Millikan Atom model

    Robert Millikan Atom model

    Determined the size of the charge of an electron.

  • J.J Thomson Death

  • Niels Bohr Atom Model

    Niels Bohr Atom Model

    Electrons should move around the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted.

  • Max Planck Death

  • Werner Heisenberg Atom Model

    Werner Heisenberg Atom Model

    Discovered a key piece of the quantum theory. Created quantum machinery.

  • Robert Millikan Death

  • Erwin Schrodinger Death

  • Niels Bohr Death

  • James Chadwick Death

  • Werner Heisenberg Death