History of the Atom

By Andypoo107
  • 460 BCE

    Democritus

    He created the term Atom. Believed that your are able to divide something untill it cannot be broken down anymore.
  • 340 BCE

    Aristotle

    Disagreed with the Atomic Theory (Democritus). Believed in air, earth, water, fire and aether.

  • Antoine Lavoisier

    Created the law of conservation (Mass cannot be created nor destroyed)

  • Evangelista Torricelli

    Atmospheric pressure could push mercury up a tube to firgure. Came up with the barometer.

  • Joseph Loius Proust

    Discovered the law of definitive proportions which states that in any compound the elements are present in a fixed proportion by weight.

  • John Dalton

    adopted Democritus' theory into the first modern atomic model.

  • J.J. Tomson

    Credited for discovering the electron. Used the reasearch on a Cathode Ray Tubes.

  • Niels Bohr

    Electrons do not travel on a specific path or orbit.

  • Ernest Rutherford

    Set up the Gold Foil experiment, discovering there must be a positive centre of the foil. He called it a nucleus.

  • Erwin Schrodinger

    Made the Cloud Model. Found out where we can predict where an electron will be.

  • Werner Heisenberg

    Proposed the "Uncertainty Relation" setting limits for how precisely the position and velocity of a particle.

  • James Chadwick

    Found that Alpha particles have a neutral particle with about the same mass as a proton.