Hoyo-Minahan-Period 7

By Sam Minahan

  • Democritis

    Democritis
    1. During the time of Ancient Greece (450 B.C.)
    2. He did not do his own experiments.Democritis was a "thinker". He drew his own model.
    3. He tried proving the notion of an atom: -A piece of matter that is the smallest part. "Atomos"
  • Period: to

    Hoyo- Minahan- Period 7

  • Aristotle

    Aristotle
    1. Time of Ancient Greece (450 B.C.)
    2. He did not do expirements. He was a "thinker".
    3. He tried proving that all substances are made up of four elements: -Earth, Wind (air), Fire, and Water

  • John Dalton

    John Dalton
    1. During the 1780s in England.
    2. He opened a school at age 12.
    3. Known as the "Father of Atomic Theory".
    4. His theory was: -Atoms make up all elements -Atoms of the same element are identical -Atoms of different elements are different -Atoms of different elements react to form compounds -Atoms cannot be created or destroyed, only changed
    5. Dalton thought the atom looked like a sphere (shown in picture)
    6. He showed this while studying the nature and chemical makeup of air.

  • J.J. Thomson

    J.J. Thomson
    1. During the 1890s.
    2. Thomson found that negative particles exist. (electrons)
    3. Found in his Cathode Ray Tube.
    4. Proven in The Plum Pudding Model.
    5. His Cathode Ray Tube found the negative particle by having battery type wires that had electric potential and was connected to a cathode ray tube. When he held a positive magnet to the cathode ray tube, the current was slower becasue of the negative particle. (electron)

  • Henri Becquerel

    Henri Becquerel
    1. Becquerel born Dec. 15, 1852 death Aug. 25, 1908.
    2. He was physicist.
    3. Discovered raioactivity in 1896.
    4. He had already known it was caused by an unknown energy that was emitted from uranium salt.
    5. Becquerel had left a salt rock wrapped and a photographic plate in a desk drawr.
    6. Next day he had discovered that it had developed patterns which would ordinarily indicate in exposure.
    7. Won Nobel Prize in 1903 with the Curies.

  • Marie and Pierre Curie

    Marie and Pierre Curie
    1. Marie born Nov. 7, 1867 death July 4, 1934.
    2. Pierre born May 15, 1859 death April 19, 1906.
    3. Marie tested every substance she could find to detect the radiation from a radioactive atom. (around 1896)
    4. Tested pitchblende, more radioactive than uranium.
    5. 1898, Curies worked to separate pitchblende into other metals it contained.
    6. Used qualitive analysis for their expirement.
    7. Discovered polonium and radium.
    8. Proved that elements are made of other elements.
    9. Nobel Prize - 1903.

  • Ernest Rutherford

    Ernest Rutherford
    1. Rutherford born Aug. 30, 1871 death Oct. 19, 1937.
    2. Discovered the Nucleus in 1910s.
    3. He descibed the nucleus as: -very small, very dense, and has a positive center.
    4. He had discovered this in his e- Cloud Model and through his Gold Foil Expiriment.
    5. Goild Foil Expirement used heavy radiation on alpha particles going through gold foil and bouncing off of a photoelectric gate.

  • Robert Millikan

    Robert Millikan
    1. Millikan born March 22, 1868 death Dec. 19, 1953.
    2. He was an American experimental physicist.
    3. Discovered the measurement of the charge of the electron in 1910 and worked on the photoelectric effect.
    4. Millikan used his own Oil-Drop Experiment, in which he measured the charge on a single electron.
    5. He built on work by J.J. Thomson by finding the actual charge and mass value.

  • Niels Bohr

    Niels Bohr
    1. Bohr born Oct. 7, 1885 death Nov. 18, 1962.
    2. Bohr came up with a new theory of the structure of the atom in 1913.
    3. He is also known as the "Father of the Quantum Theory".
    4. He said that electrons travel in fixed orbits around the atoms nucleus. 5.Explained how electrons absorb energy.
    5. The orbits determine chemical properties of an atom.
    6. Bohr built an atomic diagram to prove his theory.
    7. His theory formed a basis of quantum mechanics.
    8. Nobel Prize in 1922 for Physics.

  • James Chadwick

    James Chadwick
    1. Chadwick born Oct. 20, 1891 death July 24, 1947.
    2. Discovered the Neutron in 1932.
    3. Proven through multiple experiments of radioactivity.
    4. Neutron is the elementary particle without any electrical charge and a fundamental building block of the atoms nucleus.
    5. Won the 1935 Nobel Prize in Physics.
    6. Worked in Germany during World War 1.