Mrs. Foys chemistry class timeline
Created by dplitsch17 on Oct 2, 2008
Last updated: 11/17/09 at 05:59 AM
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James Chadwick was a British physicist who added to the discovery of protons by finding a particle called a neutron inside the Nucleus of an atom.
Added knowledge to the structure of the atom and worked on the creation of the first atomic bomb.
Earnest Rutherford determined that a small particle called a Proton is found inside the Nucleus of an atom (+1).
Robert Millikan was an American physicist who discovered the charge of an electron (-1) and that the mass of an electron equals 1/1840 times that of a hydrogen atom.
The plum pudding model of the atom by J.J. Thomson was thought up in 1904 before the discovery of the atomic nucleus. In the model, the atom is composed of electrons, surrounded by a cluster of positive charges to balance the electron's negative charges, like negatively-charged "plums" surrounded by positively-charged "pudding".
Wilhelm Roentgen was accredited to the discovery of extremely unknown and powerful radiation most commonly known as X-Rays. These rays could strangely pass through materials such as skin. It was first put to medical use in 1986.
J.J Thompson is a British physicist who is known for discovering that "Cathode Rays" are really negatively charged particles, called "electrons".
William Crookes is known for the discovery of the element Thallium and was the first to Helium. He also was the first to investigate plasmas and created a device in which to study nuclear radioactivity.
Ernest Rutherford was a New Zealand physicist who is accredited as the father of nuclear physics. He disproved the plum pudding model and proved that the atom must have an extremely small, positive charged Nucleus.
Marie Curie is a Polish scientist who went on to win 2 Nobel Prizes. She was first to use the word Radiation to describe radioactive isotopes. She was also accredited for the discovery of the elements Radium and Polonium. Curie was the first person to use radiation to help treat cancers.
Lavoiser is a chemist who has greatly influenced science by developing the law of conservation of mass, naming Oxygen and Hydrogen, developing the metric system, and writing of the list of elements.
John Dalton was the first to determine the atomic weights of the gases on the periodic table of elements. He is also accredited for creating the atomic theory.
Geber was an Arabian alchemist who is well known for distilling strong acetic acid from vinegar and theorized that metals are made up of mercury and sulfur in varying proportions. He also popularized the of combining mercury and sulfur to create gold.
Democritus was the first to state that matter was made of small particles called atomos (atoms). These atoms could not be created, destroyed or further divided.
Thought that matter was either air, fire, water, or earth. Aristotle was wrong and Democritus was right.