History of the Atom Timeline by Michaela McHugh and Kathryn Peay

By michaela.mchugh2017
  • 400

    Aristotle

    Aristotle
    His theroy was that no matter the number of times you cut matter in half ,you would always have a smaller piece of mater .
    He discovered that there is always a smaller piece of matter in an atom.
    Also he did not believe in the atomic theorey.he beliebed in the four elements(earth, fire ,water, and air)
    Shields, Christopher. "Aristotle." Stanford University. Stanford University, 25 Sept. 2008. Web. 20 Feb. 2014.
  • 450

    Democritus

    Democritus
    He discovered that that atom could not be divided into any smaller pieces. Well atleast he thought. He came up with the theory all matter conatins atoms.
    His theory was "matter could not be divided into smaller and smaller pieces forever, eventually the smallest possible piece of matter will shhow up.
    "HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 18 Feb. 2
    He used the mircoscope method to find this out.

  • Dalton

    Dalton
    He discovered that all matter is made of atoms and they are indestructible.
    All atoms are given element identialin mass and properties.
    He model was the billiard ball.
    "HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 18 Feb. 2014.

  • Thomson

    Thomson
    His discovered that the simliar to the billard ball but until the 19th century he discovered Electons.
    Atoms do have smaller pieces and they are Electrons and protons.he said as his theory .
    His model was the plum pudding atom.
    "HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 18 Feb. 2014.

  • Rutherford

    Rutherford
    He accuratley described the structure of an atom .
    founded the nucleus. He thoery that the nucleus takes one-billionth of voulme of an atom .
    His method of discovery atom was founded by the GOLD foil experiment.
    "HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 18 Feb. 2014.

  • Bohr

    Bohr
    He discovered that the electrons orbit the nucleus without losing energy.
    Electron with low energy went to nuclues and ones away were more energy.
    He proposed that the electrons are restricted to a certain fixed (quantized) orbits.
    He made the Planetary Atom.
    "HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER." HISTORY OF THE ATOM FROM DEMOCRITUS TO BOHR AND SCHRÖDINGER. N.p., n.d. Web. 18 Feb. 2014.

  • Heisnburg and schrodinger

    Heisnburg and schrodinger
    Heisenburg discovered the Quantum Theory whils Schrodinger built on the theory with creating quantum numbers.
    Schrodinger used the wave equations that are the princple, angular and magnetic quantum numbers.
    The quantum numbers descirbe the size, shape, and orientation in space of orbits on an atom.
    Atom." Atom. N.p., n.d. Web. 20 Feb. 2014.
    The Model they used was the