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Democritus first explained decay ,the theory meant that matter could never be destroyed but change shape in the world
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1.All matter consists of invisible particles called atoms.
2. Atoms are indestructible.
3. Atoms are solid but invisible.
4. Atoms are homogenous.
5. Atoms differ in size, shape, mass, position, and arrangement.
->Solids are made of small, pointy atoms.
->Liquids are made of large, round atoms.
->Oils are made of very fine, small atoms that can easily slip past each other. -
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Alchemy in the Middle Ages was a mixture of science, philosophy and mysticism. Far from operating within the modern definition of a scientific discipline, medieval alchemists approached their craft with a holistic attitude; they believed that purity of mind, body and spirit was necessary to pursue the alchemical quest successfully. At the heart of medieval alchemy was the idea that all matter was composed of four elements: earth, air, fire and water.
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In this time John Dalton started his Diary of 200,000 meteorite observations. This helped the scientific community because it gave years of insight into this field.
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John Dalton wrote essays on his famous experiments some experiments use compression of gas and water vapor.
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John Dalton had gotten a Royal Medal at this time
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A electron is a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
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In 1896, French scientist Antoine Henri Becquerel discovered radioactivity which was an early contribution to atomic theory. He discovered this phenomenon while experimenting with uranium and a photographic plate.
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X-ray beams pass through objects, and they are absorbed in different amounts depending on the density of the material they pass through. Dense materials, such as bone and metal, show up as white on X-rays.
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Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white. Polonium is a chemical element with symbol Po and atomic number 84. A rare and highly radioactive metal with no stable isotopes, polonium is chemically similar to selenium and tellurium.
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J.J Thompson toke on Ernest Rutherford as a student.
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J.J Thompson created the plumb pudding structure
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Ernest Rutherford proved J.J Thompson pudding structure wrong.
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He won this Nobel prize because of his Disintegration Theory
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The Bohr model shows that the electrons in atoms are in orbits of differing energy around the nucleus.
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He becomes a professor at the University of Copenhagen
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For the first time in the world a phyisicist changes one element into another.
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This is the first women to win the noble prize.
