Atomic Model Timeline

By byrommd
  • 460 BCE

    Democritus

    Democritus
    He was the first to propose an atomic universe. Democritus reportedly wrote over 70 treatises, only a few hundred fragments have survived.
  • 347 BCE

    Plato

    Plato
    He was founder of the Platonist school of thought, and the Academy, the first institution of higher learning in the Western world.
  • 332 BCE

    Aristotle

    Aristotle
    He made significant contributions to astronomy simply by observing how nature behaved and always being inquisitive about the mysteries of the world.

  • the alchmists

    the alchmists
    they discovered phosphorus. Johann Georg Rapp was a famous alchemist.

  • Robert Boyle

    Robert Boyle
    He discovered that the volume of a gas decreases with increasing pressure. He is known by many as the Father Of Modern Chemistry.

  • Lavoisier

    Lavoisier
    Lavoisier helped construct the metric system, wrote the first extensive list of elements, and helped to reform chemical nomenclature. He also named oxygen and hydrogen.

  • John Dalton

    John Dalton
    He did experiments on gases that led him to discover that the total pressure of a mixture of gases amounted to the sum of the partial pressures that each individual gas exerted while occupying the same space.

  • Dmitri Mendeleev

    Dmitri Mendeleev
    He is best known for his discovery of the periodic law, and for his formulation of the periodic table of elements.

  • J.J Thomson

    J.J Thomson
    He announced his discovery that atoms were made up of smaller components. And discovered the electron and then went on to propose a model for the structure of the atom. He invented the plum pudding model.

  • Albert Einstein

    Albert Einstein
    He came up with the concept that light is made up of particles called photons. Most scientists of his day didn't agree, but later experiments showed this to be the case.

  • Robert Millikan

    Robert Millikan
    He was a physicist who discovered the elementary charge of an electron using the oil-drop experiment. He charged droplets of oil between two electrodes and balanced the gravitational force with the upward forces

  • Ernest Rutherford

    Ernest Rutherford
    He postulated the nuclear structure of the atom, discovered alpha and beta rays, and proposed the laws of radioactive decay.

  • Neils Bohr

    Neils Bohr
    Neils Bohr discovered that electrons travel in separate orbits around the nucleus, and that the number of electrons in the outer orbit determines the properties of an element.

  • Henry G. J. Mosely

    Henry G. J. Mosely
    He used self-built equipment to prove that every element’s identity is uniquely determined by the number of protons it has. His discovery revealed the true basis of the periodic table

  • The Curies

    The Curies
    She championed the use of portable X-ray machines in the field for WW1. These medical vehicles earned the nickname "Little Curies."

  • Werner Heisenberg

    Werner Heisenberg
    He discovered a way to formulate quantum mechanics in terms of matrices. He also was a main contributor to the German atomic program during World War II, in direct competition with the Manhattan Project.