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Chem I Final Review
Chem II Final Review
Wilhelm Roentgen 1895
Wilhelm Roentgen was born in 1845 in Germany. He is know for his discover of X-Rays. He discoverd electromagnetic radiation. In 1895 Roentgen was studying different types of vacuum tube equipment when an electric surge went through them. He would fill them with different gasses and record the effect. The tube produced a fluorescent glow. He covered the tube in heavy black paper. A few feet from the tube was a spot of green florescent light. Roentgen had discovered some sort of rap with the ability to pass through objects. Roentgen realized that it would pass through tissue. He put film on the other side and captured the image of his wife's hand.
The first x-ray
Henri Becquerel 1896
Henri Becquerel was a French Physicist. He is known for the discovery of radioactivity. In 1896 he was investigating phosphorescence in Uranium he stumbled on radioactivity. Marie Curie and Pierre Curie discovered followed in Becquerel's footsteps.Becquerel describes his experiment:
One wraps a Lumière photographic plate with a bromide emulsion in two sheets of very thick black paper, such that the plate does not become clouded upon being exposed to the sun for a day. One places on the sheet of paper, on the outside, a slab of the phosphorescent substance, and one exposes the whole to the sun for several hours. When one then develops the photographic plate, one recognizes that the silhouette of the phosphorescent substance appears in black on the negative. If one places between the phosphorescent substance and the paper a piece of money or a metal screen pierced with a cut-out design, one sees the image of these objects appear on the negative. … One must conclude from these experiments that the phosphorescent substance in question emits rays which pass through the opaque paper and reduces silver salts."
J.J. Thomson 1897
JJ Thomson was born in Cheetham hill England in 1856. He is credited for the discovery of the electron and isotopes. Thomson used cathode rays and cathode ray tubes to discover the electron. Thompson used the magnetism in the cathode ray tube to show the electrons were prevalent. Thomson discovered Isotopes in 1913 when he streamed a channel of neon through a magnetic and electric field. He found that neon could have two different atomic masses. This was the first discovery of isotopes of a stable element. He was awarded the Nobel Peace Prize in 1906.
The Plum Pudding Model
The Plum Pudding model was made by JJ Thomson. This was his idea of what an atom looked like. There was no centralized mass. There was plums and pudding in every model. The Plums were the negatively charged electrons and the pudding was a positively charged solution surrounding the plums. The plums were stationary. This was a major advancement in the structure of an atom.
Marie Curie 1898
Maria Sklodowska was born in 1867 in Warsaw. She later married her husband Pierre Curie. Marie Curie set out to test that the energy was not contained inside the atoms. Marie Curie wanted to prove that the earth was full of radioactive wave energy. Marie Curie tested all the elements to make see if any of the know elements would make air conduct electricity better. Her research showed that thorium compounds emit becquerel rays. Marie Curie discovered radioactivity.
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