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Democritus (born c. 460 BCE—died c. 370)

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Democritus (born c. 460 BCE—died c. 370)

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An ancient Greek philosopher who discovered the development of atomism and the atomic theory. His theory was that everything is composed of atoms that are invisible. He also believed that they were indestructible and always in motion . He determined that they have different atomic spaces and sizes.

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John Dalton was a chemist who made the first atomic model that showed all the atoms and their properties. His theory was based off of two laws The law of conservation of mass and the law of composition. The theory states that all matter is composed of atoms. He also says that "while all atoms of an element are identical different elements had different size atoms".

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J.J. Thomson discovered the electron by experimenting with a Crookes or cathode ray tube. He demonstrated that cathode rays are negatively charged. He also studied positively charged particles in neon gas.

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In 1904 J.J. Thompson created this model of an atom that had a positively charged medium with negatively  charged inside. It's called the Plum Pudding model because people thought it looked like pudding with electron inside of it.

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Nuclear Power for Everybody - What is Nuclear Power

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What is Nuclear Power? This site focuses on nuclear power plants and nuclear energy. The primary purpose is to provide a knowledge base not only for experienced.

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The nuclear atomic model was made in 1911 by a scientist named Ernest Rutherford.

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The discovery of the charge of an electron was in 1909 by a scientist named Robert Millikan.

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the Bohr model depicts an atom as a small, positively charged nucleus surrounded by electrons. These electrons travel in circular orbits around the nucleus. This model was created by Niels Bohr.

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Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom.

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In May 1932 James Chadwick announced that the core also contained a new uncharged particle, which he called the neutron.

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American Welding Society (AWS) - Your Source for Welding Expertise

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Learn more about the benefits of AWS education and explore our course catalog to help you achieve your career goals.