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He was an ancient Greek philosopher who theorized atoms were specific to the material they composed.
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Plato said that the ideal geometric forms were atoms.
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He did not believe in the atomic theory and thought everything was made of either earth, air, fire, or water.
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They laid don the foundation for the periodic table by proving the existence of atoms.
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He defined the law of conservation mass, which helped shape the atomic theory.
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He introduced the atomic theory into chemistry.
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This law said if elements are organized by atomic mass similar atoms will be by each other.
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He measured the electric chare and did famous work on the photelectric effect.
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The periodic table of elements which organizes different elements based off their atomic mass, or number of protons.
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The emission of electrons when electromagnetic radiation hits something.
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Radioactivity was accidentally discovered when Henri Decquerel opened a drawer with spontaneous radioactivity.
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Scientist's found the electron while searching for electrical properties of matter in cathode rays.
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This theory says light must be 3,200 Kelvin Degrees so that the energy is visible.
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A historic model of the atom.
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Robert Millikan used negatively charges oil droplets to measure the charge of an electron. The charge is A~-1.60A~-10-19 coulombs.
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He hit gold foil with positively charged particles, which mostly went through.
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In this atomic model electrons travel around the nucleus like planets orbit the sun.
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He stated the number of protons is the atomic number.
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His nuclear research led him to split the atom then he discovered protons.
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This is an equation that determines the wave function of a quantum-mechanical system.
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Heisenberg said that we will not be able to know the place and speed of a particle accurately.
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James Chadwick said the core of the atom had an uncharged, or neutral, atom called the neutron.