Atomic Timeline

  • The Alchemists
    500 BCE

    The Alchemists

    Believed that mundane elements could be changed into gold and they were all made of the same material
  • Democritus
    430 BCE

    Democritus

    He said that atoms did different things and caused different emotions or shapes
  • Plato
    427 BCE

    Plato

    He theorized that all things are made of small geometric shapes
  • Robert Boyle

    Robert Boyle

    Proposed that all things were made of atoms or corpuscles
  • Antoine Lavoisier

    Antoine Lavoisier

    He proved that mass cannot be created or destroyed only changed from one form to the next
  • John Dalton

    John Dalton

    Proposed the atomic theory that said all things were made of small invisible building blocks
  • Amedeo Avogardo

    Amedeo Avogardo

    He found out that different gasses had the same amount of molecules.
  • Dimitri Mendeleev

    Dimitri Mendeleev

    Developed a way to catalog all known elements in the "periodic table
  • Pierre and Marie Curie

    Pierre and Marie Curie

    They discovered Radium and Polonium
  • JJ Thompson

    JJ Thompson

    Made the plum pudding model, a theoretic description of the atom
  • Albert Einstein

    Albert Einstein

    Proved that atoms exist by calculating the force on pollen in water
  • Ernest Ruthford

    Ernest Ruthford

    He discovered that all atoms are mostly empty, he also learned about the nucleus
  • Neils Bohr

    Neils Bohr

    Discovered the hydrogen atom, He also discovered a way to measure subatomic particles
  • Henry G J Mosley

    Henry G J Mosley

    Concluded that all protons are positively charged and are a part of the nucleus. He also altered the atomic timeline.
  • Erwin Schrödinger

    Erwin Schrödinger

    He developed a method to measure energy in electrons with a formula.
  • Anton Heisenberg

    Anton Heisenberg

    He Developed an equation to calculate the energy levels in atoms
  • James Chadwich

    James Chadwich

    Developed the billiard ball model and discovered neutrons