The Atom Timeline By Paige Kromas

  • Jan 1, 1000


    Developed the idea of an atom. Conceived the idea that matter was made up of minuscule, irreducible particles, which he called atoms, a name derived from the Greek word atomos, meaning indivisible. (460 B.C.)
  • Jan 1, 1000


    (322 B.C.) Claimed that there was no smallest part of matter (atoms) and that different substances were made up of proportions of fire, air, earth, and water.
  • Antonie Lavosier

    Antonie Lavosier
    Came up with the Law of Conservation of Mass.
  • Joseph Proust

    Joseph Proust
    Proposed the Law of Constant Composition.
  • Dalton

    Stated that all matter is made of indivisible and indestructible atoms, which differ from element to element.The atom, it was assumed, was of uniform density and constitution. Discovered the Dalton theory. Law of Multiple Proportions.
  • Invention of the Light Bulb

    Invention of the Light Bulb
  • Amadeo Avogadro

    Amadeo Avogadro
    Avogadro's Hypothesis. The hypothesis states that at the same temperature and pressure, equal volumes of gases contain the same number of molecules or atoms
  • Invention of the First Camera

    Invention of the First Camera
  • The Invention of the Telephone

    The Invention of the Telephone
  • William Crookes

    William Crookes
    Discovered cathode-ray tubes.
  • First Car was Invented

    First Car was Invented
  • First Tractor was Invented

    First Tractor was Invented
  • Invention of the Radio

    Invention of the Radio
  • J.J. Thompson

    J.J. Thompson
    Discovered the electron.
  • Madam Curie

    Madam Curie
    Stated that radioactive materials cause atoms to break down spontaneously, releasing radiation in the form of energy and subatomic particles.
  • Henri Becquerel

    Henri Becquerel
    Discovery radioactivity along with Madame Curie.
  • Invention of the First Vacuum

    Invention of the First Vacuum
  • Max Planck

    Max Planck
    Stated that energy is radiated in small, discrete units, which he called quanta.
  • Albert Einstein

    Albert Einstein
    The existence of atoms of finite size
  • Robert Millikan

    Robert Millikan
    Calculated mass of a single electron
  • Rutherford

    Found evidence that the atom really consisted of a highly dense nucleus and a vast empty space in which the electrons orbited.
  • Henry Moseley

    Henry Moseley
    The atomic number was equal to the positive charge (charge on the nucleus) of an atom.
  • Niels Bohr

    Niels Bohr
    Created Bohr Model.
  • Louis deBrogile

    Louis deBrogile
    Suggested matter consists of waves.
  • Invention of the T.V.

    Invention of the T.V.
  • Erwin Schrodinger

    Erwin Schrodinger
    Schrödinger model. Explained movement of an electron in an atom as a wave.
  • Werner Heisenberg

    Werner Heisenberg
    Uncertainty Principle, which says that the more precisely the position of a particle is determined, the less precisely the momentum is known in this instant, and vice versa.
  • James Chadwick

    James Chadwick
    Proved that neutrons, neutral particles in the nucleus that made up approximately
half the mass of an atom, did exist
  • Invention of the Computer

    Invention of the Computer
  • Invention of the DVD Player

    Invention of the DVD Player