The Atomic Theory timeline

By 26cbuck
  • 500 BCE

    The Alchemists

    The Alchemists
    In the year of 500bc, The Alchemists started testing Aristotle's theory of atomic. Shortly after they tried to treat different metals or ores to create something more valuable.
  • 428 BCE

    Plato

    Plato
    Plato came up with the idea of elements and discovered matter comes from five main elements.
  • 400 BCE

    Democritus

    Democritus
    In the year 400 Democritus proposed the idea that all matter is made of atoms.
  • Robert Boyle

    Robert Boyle
    In the year of 1640 Boyle proposed the idea that atoms existed.
  • Antone Lavoisier

    Antone Lavoisier
    In the year of 1777 Lavoisier proved the theory of conservation of matter and explained the ideas behind fire.
  • Billiard Ball Model

    Billiard Ball Model
    Since atoms were the smallest particles they were seen as small solid ball like a billiard ball.
  • John Dalton

    John Dalton
    In the year of 1803, John Dalton brought up the idea that all matter was made up of atoms. And that all atoms were the building blocks that no one can see and can not be destroyed.
  • Amedeo Avogardo

    Amedeo Avogardo
    In the year of 1811 Avogardo proposed the idea that equal volumes of gases have the same temperature and pressure.
  • Dmitri Mendeleev

    Dmitri Mendeleev
    Came up with the periodic table. Played a major role in changing chemistry in Russia.
  • JJ Thompson

    JJ Thompson
    Came up with the idea of charge to mass ratio of electrons, he also discovered the electron or the first subatomic particle.
  • Solar System Model

    Solar System Model
    A model described as a central mass of positive entity.
  • Pierre and Marie Curie

    Pierre and Marie Curie
    Recognized and studied radioactive elements. Were the first people to win two Nobel peace prizes.
  • Albert Einstein

    Albert Einstein
    In the year of 1905 Einstein proposed the idea quantum light has a wave nature that gives out a certain amount of matter it posses. Started the idea of energy of mass theory.
  • Robert Millikan

    Robert Millikan
    In the year of 1908 Millikan discovered the charge of the electron
  • Ernest Rutherford

    Ernest Rutherford
    Finalized the small dense positively charged nucleus. Also discovered that atoms were indestructible during the research with radioactivity.
  • Neils Bohr

    Neils Bohr
    In the year of 1913, proposed the idea of atomic structure theory, that the outer orbit of the atom can have more electrons than the inner section.
  • Henry G. J. Mosley

    Henry G. J. Mosley
    Developed the the idea of the number of protons in a element and the atomic number he also invented the first atomic battery.
  • Erwin Schrodinger

    Erwin Schrodinger
    Discovered the energy levels of electrons in atoms. Came up with the theory of Schrodinger's cat.
  • Electron Cloud Model

    Electron Cloud Model
    A model of a atom in which where a electron would most likely be found.
  • Heisenberg

    Heisenberg
    In the year of 1927 Heisenberg formulated the quantum mechanics and developed the uncertainty principal.
  • James Chadwhich

    James Chadwhich
    Discovered the existence of the neutron. Won a Nobel peace prize in physics
  • Plum Pudding Model

    Plum Pudding Model
    Proposes the idea that electrons are surrounded by a volume of positive charge.