Science Atomic theory

  • Plato
    427 BCE

    Plato

    He believed there were more than 2 elements
  • Period: 427 BCE to

    Atomic theory

  • Democritus
    400 BCE

    Democritus

    Central figure in the devolpment of atomic theory of the universe.
  • The alchemists
    400 BCE

    The alchemists

    They heavily studieed fermentation, distilation, sublimation, calcination
  • Solar system model
    330 BCE

    Solar system model

    A model that illustrates the positions and mosions of our solar system
  • Robert Boyle

    Robert Boyle

    Boyles Theory: States that a gas's pressure and volume are proportional
  • Antone Lavoisier

    Antone Lavoisier

    Father of modern chemistery
  • Billiard ball model

    Billiard ball model

    Daltons way of modeling an atom
  • John Dalton

    John Dalton

    introduced atomic theory
  • Amedeo Avogadro

    Amedeo Avogadro

    Believed equal volume of gas contain equal number of molecules. Elementry gases are composed of 2 atoms.
  • Dmitri Mendeleev

    Dmitri Mendeleev

    Discovered periodic law and arranged the elements in the periodic table
  • JJ Thompson

    JJ Thompson

    Discovered the electron
  • Pierre and Marie Curie

    Pierre and Marie Curie

    Discovered 2 radioactive elements: Polonium, and Radium
  • Ernest Rutherford

    Ernest Rutherford

    discovered the 2 types of radiation: non-ionizing radiation and ionizing radiation.
  • Plum pudding model

    Plum pudding model

    Depicts electrons in a cloud around the dense nucleus
  • Robert Millikan

    Robert Millikan

    Discovered the electronic charge of an electron using the oil-drop experiment
  • Neils Bohr

    Neils Bohr

    Proposed a model of an atom in which the electron was able to occupy only certain orbits around the nucleus
  • Henry G.J. Mosely

    Henry G.J. Mosely

    Moselys law: State that the square root of the frequency of the emitted x-ray is proportional to the atomic number.
  • Albert Einstein

    Albert Einstein

    Discovery of the Phebelectric Effect.
  • Erwin Schrödinger

    Erwin Schrödinger

    Schrödinger equation: Describes the evolution of the wave function
  • Electron cloud model

    Electron cloud model

    Discovered by Erwin Schrödinger. An electron cloud represents the area around an atom's nucleus where electrons are most likely to be found.
  • James Chadwich

    James Chadwich

    Discovery of the Neutron