Atomic Timeline

By Luca-Luca
  • 500 BCE

    The Alchemists

    The Alchemists
    The Alchemists found a substance that made silver or gold with more common elements.
  • 427 BCE

    Plato

    Plato
    Introduced the atomic theory with atoms were ideal geometric figures.
  • 400 BCE

    Democtritus

    Democtritus
    Theorized that unsplit table small atoms made all materials in bodies.

  • Robert Boyle

    Robert Boyle
    Published the Scopticel about how all matter is composed of important particles from which all materials are constructed.

  • Antoine Lavoisier

    Antoine Lavoisier
    Found out the reactants and the total mass of products in a chemical reaction is always the same.

  • John Dalton

    John Dalton
    Theorized that all matter was made of atoms, indestructible building blocks, and were indivisible. Different elements were made of different sized and mass.

  • Billiard Ball Model

    Billiard Ball Model
    Didn't show any nucleus or electrons and defined an atom to be a ball like structure.

  • Dmitri Mendeleev

    Dmitri Mendeleev
    Proved the arrangement of elements in the order of their increasing atomic weights.

  • Robert Milikan

    Robert Milikan
    Found out that electrons charge was always a multiple of precisely determined charges.

  • JJ Thompson

    JJ Thompson
    Theorized that tiny negatively charged subatomic electrons or particles were found in atoms.

  • Pierre and Marie Crie

    Pierre and Marie Crie
    Theorized one of the reason atoms break down are radioactive particles.

  • The Curies

    The Curies
    Discovered the existence of the element's radium and polonium.

  • Plum Pudding Model

    Plum Pudding Model
    Was made to explain two properties of the atom.

  • Albert Einstein

    Albert Einstein
    Einstein helped revolutionize science through the use of statics and probability by mathematically proving atoms exist.

  • Neils Bohr

    Neils Bohr
    Proposed an atomic structure thing that said the inner orbit of an atomic held less electrons than the outside.

  • Solar System Model

    Solar System Model
    Showed hoe the electrons orbit about the nucleus at different distances.

  • Henry G. J. Mosely

    Henry G. J. Mosely
    Proposed that the number of positive charges in the atomic nucleus is the atomic number.

  • Ernest Rutherford

    Ernest Rutherford
    Proposed that nearly all of an atom is empty space, so when alpha particles go through the empty space the nucleus has a very little reaction.

  • Electron Cloud Model

    Electron Cloud Model
    Predicts the likely location of the electron based on a fraction of probability.

  • Erwin Schrodinger

    Erwin Schrodinger
    Created the first electron cloud model.

  • James Chadwich

    James Chadwich
    Discovered the Neutron in atoms.

  • Almadeo Avogrado

    Almadeo Avogrado
    Discovered that elements were not only found in individual atoms but instead be found in molecules.