Atom with electrons

Discovery of the atom by Cody Ward

By GA0101
  • Jan 1, 1000


    Thought of the idea of atoms and that they could not be created, destroyed, or further divided.
  • Jan 1, 1005


    Could not believe that the “nothingness” of empty space could exist
  • Jan 1, 1503

    First Hospital in North America

    First Hospital in North America
    First hospital in North America was built in 1503 in Santo Domingo.
  • First car

    First car
    First car was made in 1939.
  • Joseph Proust

    Joseph Proust
    Proposed the the Law of Constant Composition in 1799. This law was very radical at the time and was hotly contested by Claude Berthollet.
  • John Dalton

    John Dalton
    Revised Democritus’s ideas based upon the results of scientific research
    Dalton’s Atomic Theory
    • All matter is composed of extremely small particles called atoms.
    • All atoms of a given element are identical, having the same size, mass, and chemical properties. Atoms of a specific element are different from those of any other element.
    • Atoms cannot be created, divided into smaller particles, or destroyed.
    • Different atoms combine in simple whole- number ratios to form compounds.
    • In
  • Amadeo Avagadro

    Amadeo Avagadro
    Proposed what is now known as Avogadro's Hypothesis in 1811. The hypothesis states that at the same temperature and pressure, equal volumes of gases contain the same number of molecules or atoms. When this is combined with Gay-Lussac's Law of Combining Volumes, the only possible formulas for hydrogen, oxygen and water are H2, O2 and H2O, respectively. The solution to the atomic weight problem was at hand in 1811.
  • Civil War

    Civil War
    The United States went to battle with our own people.
  • William Crookes

    William Crookes
    Constructed this forerunner of the modern television picture tube to investigate the properties of cathode rays.
  • First Movie

    First Movie
    The Horse in Motion was the first movie made.
  • First lightbulb

    First lightbulb
    The first lightbulb was made.
  • Henri Becquerel

    Henri Becquerel
    While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays.
  • J. J. Thomson

    J. J. Thomson
    First to discover the electron.
  • Madam Curie

    Madam Curie
    Studied uranium and thorium and called their spontaneous decay process "radioactivity". She and her husband Pierre also discovered the radioactive elements polonium and radium.
  • Albert Einstein

    Albert Einstein
    Published his famous equation E=mc 2.
  • Robert Millikan

    Robert Millikan
    Dealt with the fundamental constituents of the of the universe, the forces they excert on one another, and the results produced by these forces.
  • Ernest Rutherford

    Ernest Rutherford
    Became a Nobel laureate for his pioneering work in nuclear physics for his theory of the structure of the atom.
  • World War 1

    World War 1
    A world wide war.
  • First color movie

    First color movie
    Cupid Angling was the first color movie.
  • Henry Bohr

    Henry Bohr
    Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of successive orbital shells of electrons.
  • Louis deBroglie

    Louis deBroglie
    Discovered that electrons had a dual nature- similarto both particles and waves. Particle/wave duality. Supported Einstein.
  • Werner Heisenburg

    Werner Heisenburg
    Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy- you can not know both the position and velocity of a particle.
  • James Chadwick

    James Chadwick
    Measured the energy of the protons emerging form the hydrogen atoms.
  • World War 2

    World War 2
    The 2nd world wide war.
  • First microwave

    First microwave
    First microwave was built.
  • First Computer Company

    First Computer Company
    J. Presper Eckert and John Mauchly made the first computer company.