Atomic Model timeline

By jvanderdonckt
  • 400 BCE

    Democritus

    Democritus
    He introduced that atoms are the basic building blocks of matter
  • 400 BCE

    Plato

    Plato
    He theorizes that solid forms of matter are composed of indivisible elements shaped like triangles
  • 800

    The alchemists

    The alchemists
    The Alchemists believed that all metals were formed form mercury and sulfur.
  • 1564

    solar system model

    solar system model
    Gailileo showed that Venus has phases like the moon.

  • Robert doyle

    Robert doyle
    Robert Boyle said that all matter was composed of tiny particles that he called corpuscles

  • Antoine Lavoisier

    Antoine Lavoisier
    He said that matter was composed of atoms that were not created or destroyed during chemical reactions

  • John Dalton

    John Dalton
    He claimed that all matter was comprised of indivisible and indestructible atoms with distinct masses and properties

  • Billiard Ball model

    Billiard Ball model
    dalton thought atoms were the smallest particles of matter, he envisioned them as solid, hard spheres, like billiard balls

  • Amedeo Avogadro

    Amedeo Avogadro
    He said that equal volumes of gasses at the same temperature and pressure contain the same number of molecules

  • Dmitri Mendeleev

    Dmitri Mendeleev
    He devised the periodic classification of the chemical elements

  • JJ thomson

    JJ thomson
    He discovered that atoms were made up of smaller components

  • Pierre and Marie Curie

    Pierre and Marie Curie
    They discovered. the strongly radioactive elements, polonium and radium

  • Plum pudding model

    Plum pudding model
    The plum pudding model depicts the electrons as negatively-charged particles embedded in a sea of positive charge. The structure of Thomson's atom is analogous to plum pudding, an English dessert

  • Albert einstein

    Albert einstein
    He said that all liquid is made up of molecules

  • Ernest Rutherford

    Ernest Rutherford
    He described the atom as having a tiny dense, and positively charged core called the nucleus

  • Robert Millikan

    Robert Millikan
    He confirmed that electrons existed

  • Neils Bohr

    Neils Bohr
    He said that the electron was able to occupy only certain orbits around the nucleus

  • Henry G.J. Mosely

    Henry G.J. Mosely
    He said that the atomic number of positive charges in the atomic nucleus.

  • Erwin Schrödinger

    Erwin Schrödinger
    He said that a wave equation that accurately calculated the energy levels of electrons in atoms

  • Electron cloud model

    Electron cloud model
    It represents the area around an atom's nucleus where electrons are most likely to be found.

  • James chadwich

    James chadwich
    He proved the existence of neutrons.