Atomic Timeline

Timeline created by hannahtremblayy
  • 400

    Aristotle and Democritus

    Aristotle and Democritus
    Aristole- opposed the atomic theory
    Democritus- theorized the first atomic theory
    Both were Greek philosphers!
  • Robert Boyle

    Robert Boyle
    First Modern Chemist
  • Charles Augustin de Coulomb

    Charles Augustin de Coulomb
    Created Coulomb's LAw and the SI Unit of electric charge also called the Coulomb.
  • Atomic Theory

    Atomic Theory
    A scientific theory of the nature of matter, which states that matter is composed of atoms. A pre-modern atomic theory was proposed by Greek philosophers Democritus, Leucippus, and the Epicureans who theorized there were invisible atoms and an empty void.
  • Joseph Proust

    Joseph Proust
    Theriozed the Law of Definate Proportions or Proust's Law.
  • John Dalton

    John Dalton
    English chemist who developed the modern atomic theory.
  • Law of Conservation of Mass

    Law of Conservation of Mass
    Antoine Lavoiser states that for any system closed to all transfers of matter and energy the mass must stay the constant over time because it can not change when nothing is added or taken away.
  • Law of Definite Proportions

    Law of Definite Proportions
    Also known as Proust's Law, it explains that a chemical compound always contains exactly the same proporton of elements as according to mass. Joseph Proust was the scientist who came up with this theory.
  • Spherical Model

    Spherical Model
    Dalton created this model.
  • James Clerk Maxwell

    James Clerk Maxwell
    Theorized special relitivity and quantum mechanics.
  • Eugen Goldstein

    Eugen Goldstein
    Discovered anode rays and is sometimes credited withn the discovery of the proton.
  • Earnest Rutherford

    Earnest Rutherford
    Father of neuclear physics.
  • Frederick Soddy

    Frederick Soddy
    Explained radioactivity and also proved isotops exist in radioactive elements.
  • Albert Einstein

    Albert Einstein
    Theorized the general theory of relitivity, had a lot to do with the field of quantum mechanics, and much more.
  • Cathode Ray Tube Experiment

    Cathode Ray Tube Experiment
    J.J. Thomson sugested atoms have parts based off of Jean Perrin's 1895 experiment. He took a pair of metal cylnders with a slit in them, connected it to an electometer, and bent the ray with a magnet. He seperated the charge from the rays. When they entered the slit, there was a negative charge. He realized the negative charge and cathode rays must be stuck together considering you cannot seperate them.
  • The Electron

    The Electron
    Theorized by Richard Laming in 1838 and G. Johnstone Stoney in 1874, the elcetron was discovered by J.J. Thomson in 1897. It is a subatomic particle with a negative elcetric chage of 1. It is represented by e-.
  • Quantum Theory

    Quantum Theory
    Physics based on the principle that matter and energy have the properties of both particles and waves. Max Planck theorized that energy can be emitted or absorbed by matter only in small units called quantra.
  • Wolfgang Pauli

    Wolfgang Pauli
    Created the Pauli Principle or spin theory which is underpinning the structure of matter and whole of chemisty.
  • Werner Heisenburg

    Werner Heisenburg
    Contributed to quantum mechanics and the uncertainty principle.
  • Plum Pudding Model

    Plum Pudding Model
    J.J. Thomson created this model which later disproved.
  • Gold Foil Experiment

    Gold Foil Experiment
    Rutherford published this experiment in 1911 after seeing J.J. Thomsons "plum pudding" model (1904). Hans Geiger and Earnest Marsden helped him in conducting it. Rutherford accidentally demonstrated the existance of the nucleus and disproved the plum pudding model.
  • Nuclear Model

    Nuclear Model
    Rutherford created this model.
  • Glenn T. Seaborg

    Glenn T. Seaborg
    Nobel Prize for Chemisty because of the transranium elements he discovered and the actinide concept.
  • Bohr Model

    Bohr Model
    Bohr theorized this model.
  • The Proton

    The Proton
    William Prout was the person to theroized this subatomic particle with a positive electric charge of 1. It is often reffered to as p+. It got its name from Ernest Rutherford (who also discovered it in 1920).
  • Quantum Mechanics Model

    Quantum Mechanics Model
    Schrodinger's model.
  • Uncertainty Principle

    Uncertainty Principle
    The Uncertainty Principle is the idea that the momentum and position of a particle cannot both be precicely determined at the same time. Werner Heisenburg therorized this fundamental principle.
  • The Neutron

    The Neutron
    Although theorized in 1920 by Ernest Rutherford, the neutron was discovered in 1932 by James Chadwick. It has no net electical charge and is also a subatomic particle. It can be written as n0.
  • Modified Neuclear Model

    Modified Neuclear Model