Atom

Atomic Timeline

By 26bmeixeiro
  • 500 BCE

    The Alchemists

    The Alchemists
    They said that all metals were formed from sulfur and mercury
  • 450 BCE

    Democritus

    Democritus
    He was the first person to say that materials were made up of smaller things he called them atomos.
  • 427 BCE

    Plato

    Plato
    He said that there was only four elements fire, Water, Air, and Earth.

  • Robert Boyle

    Robert Boyle
    He helped make a definition for an element and helped the fall of the four elements.

  • Antone Lavoisier

    Antone Lavoisier
    Came up with the Law of Conservation. He also said compounds are created from elements.

  • Billiard Ball Model

    Billiard Ball Model
    The creator of this model is John Dalton.

  • John Dalton

    John Dalton
    He said that all matter is made up of atoms. Which are invisible units.

  • Amedo Avogadro

    Amedo Avogadro
    He said that the same amount of volume of gases at the same temperature and pressure have the same amount of molecules.

  • Dmitri Mendeleev

    Dmitri Mendeleev
    He was the Father or creator of the periodic table of elements.

  • JJ Thomson

    JJ Thomson
    He discovered that atoms were made up. of something smaller

  • Pierre and Marie Curie

    Pierre and Marie Curie
    They discovered the existence of elements radium and polonium in their research.

  • Plum Pudding Model

    Plum Pudding Model
    The creator of this model is JJ Thomas

  • Albert Einstein

    Albert Einstein
    He proved that atoms were real. And he said that moleculess are always in constant movement

  • Robert Millikan

    Robert Millikan
    He discovered that there is a positively charged nucleus in the atom.

  • Ernest Rutherford

    Ernest Rutherford
    He found out that there was something in the center of an atom called a nucleus.

  • Niels Bohr

    Niels Bohr
    He said that electrons move around the nucleus but only in specific orbits.

  • Solar System Model

    Solar System Model
    The creator of this model is Niels Bohr

  • Henry Mosely

    Henry Mosely
    He said that the atomic number is the same as the number of protons in an atom.

  • Werner Heinsenburg

    Werner Heinsenburg
    He proposed the Uncertainly Principles. And he also created the Neutron Proton Model.

  • Electron Cloud Model

    Electron Cloud Model
    The creator of this model is Erwin Schrodinger

  • Erwin Schrodinger

    Erwin Schrodinger
    HE showed that the quantization of hydrogen atoms levels could be calculated from the Schrodinger equation.

  • James Chadwick

    James Chadwick
    Found out that atoms did not only have protons and electrons but also neutrons.