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Was the first to propose an atomic universe.
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Aristotle founded his own school, where he tought, studyed and wrote. Said there was no atom
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Compiled a list of 23 elements
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First to publish the Law of Definite Proportions
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pioneer in the development of modern atomic theory.
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Determine the volume of 1 mole of gas; base unit to measure the amount of a substance
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know for his cathode-ray studies, fundamental in the development of atomic physics.
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Discovered that phosphorescent and uranium salts when not exposed to light produced spontaneous emissions that darkened photographic plates
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The rays and particles emitted by a radioactive source are called radiation
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discovered the electron by experimenting with a Crookes, or cathode ray, tube.
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a photon is a particle of electromagnetic radiation with no mass that carries a quantum of energy
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overturned Thomson's model in 1911 with his well-known gold foil experiment in which he demonstrated that the atom has a tiny, heavy nucleus
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His oil drop experiment helped to quantify the charge of an electron, which contributed greatly to our understanding of the structure of the atom
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Discovered that each element had a certain number of protons and electrons called the atomic number
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Made an atomic model of a hydrogen atom to try and figure how to measure energy in an atom
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Discovered that each element had a certain number of protons and electrons called the atomic number
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Came up with a new model for the hydrogen atom: the quantum mechanical model
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Came up with the Heisenberg uncertainty principle which states that it is fundamentally impossible to know precisely both the velocity and position of a particle at the same time
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Came up with the deBroglie equation: wavelength = h/mv (m=mass, v=velocity)
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Showed that the nucleus contained subatomic particle called a neutron