William M 1

By mcswigganwm
  • 427 BCE

    Plato's Contributions to the Atomic Theory

    Plato stated that atoms are the basic geometric forms, and that every element had its own shape
  • 400 BCE

    Democritus

    Democritus figured out that every atom is specific to the material that it is composed of.
  • 322 BCE

    Aristotle's Contributions to Atomic Theory

    Aristotle did not agree with the atomic theory, and in turn stated that everything is made up of four elements, being fire, water, earth, and air

  • Lavoisier's Contributions to Atomic Theory

    Lavoisier found that mass is conserved throughout a chemical reaction

  • John Dalton's Contributions to Atomic Theory

    John Dalton proposed that every atom withing an element is exactly the same

  • The Alchemists Atomic Theory

    The Alchemists believed that all metals are formed from two things: Sulphur and Mercury.

  • Newlands Law of Octaves

    If arranged with increasing atomic mass, every eighth element will have similar chemical and physical properties

  • Mendeleev's Periodic Table

    What is unique about Mendeleev's periodic table are the empty spaces he kept in it. He therefore recognized not only are there undiscovered elements, but he also predicted their place on the table.

  • Photoelectric Effect

    The Photoelectric Effect states that electrically charged particles are released from an object when it absorbs electromagnetic radiation.

  • Discovery of the Electron

    Discovery made by JJ Thompson

  • Planck's Quantum Theory of Light

    This theory specifically states that lightbulb filaments should be heated to 3200 kelvin to reach maximum energy.

  • Plum Pudding Model

    Created by JJ Thompson

  • Rutherford's Gold Foil Experiment

    This experiment was done by Ernest Rutherford. He shot positively charged particles, otherwise known as alpha particles, at a piece of gold foil. Most particles when through the foil, thus revealing that gold is mostly empty space.

  • Charge of the Electron

    The charge was discovered in 1909 by Robert Millikan during the Oil Drop experiment

  • Robert Millikan's Contributions to the Atomic Theory

    Robert Milikan created the "Falling-Drop" method, which accurately determined the charge carried by an electron,

  • Bohr's Planetary Model

    Shows the electrons revolving around the nucleus in a specific orbit

  • Mosley's Atomic Numbers

    Henry Moseley figured out that the atomic number is equal to the number of positive charges within an atom.

  • Discovery of the Proton

    Discovery made by Ernest Rutherford

  • Schrodinger Equation

    The Schrodinger Equation "yields the eigenfunctions of a particle in an energy potential." If I could explain that in my own words, I would.

  • Heisenberg Uncertainty Principle

    The Heisenberg Uncertainty Principle states that we cannot know both the speed and position of a particle with perfect accuracy and precision.

  • Discovery of the Neutron

    Discovery made by James Chadwick

  • Discovery of Radioactivity

    Discovery made by Henri Becquerel