Chemistry Essay

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HISTORY Wilhelm Roentgen was a German scientist, who by mistake while experimenting with vacuum tubes made the discovery of X-rays. X-rays are wavelengths (light) that act as particles. The photons are absorbed by minerals creating shadows on photographic paper. In other words, light going through flesh, but creates shadows of bones. Henry Becquerel was a French scientist working in the field of Physics. In 1896 he made the discovery of natural radioactivity where minerals could produce natural x-rays. This was important to science because it introduced nuclear radiation those being alpha, beta, and gamma. Marie Curie was a physicist who won the Nobel Prize for her ingenious idea of an undiscovered radioactive element. Along with her in 1898, her husband, Pierre Curie announced the existence of radium by extracting it from another metal; they also discovered polonium. Albert Einstein noticed in__ that when nucleons combined to make nuclides they had a loss in mass. He figured that the mass lost combined with the speed of light transformed the mass into energy. This came to be known as E=mc2. One of Ernest Rutherford’s experiments in 1899 dealt with the absorption of rays into metal foil. He aimed rays at it and some subatomic-particles bounced back different amounts were absorbed suggesting different types of radiation. He named these typed of radiation: alpha, beta, and gamma rays. In_ J.J Thomson discovered the plum pudding model. This model was made up electrons flying around in positive matter. In this model no protons or neutrons existed. In 1899 Ernest Rutherford came up with his own model which contained electrons, and a nucleus. The electrons would travel around in a circular motion around the nucleus contradicting basic physical laws. The scientific community called the model “nuclear collapse.” Niels Bohr on the other hand in 1912 defended the

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