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Discovered the existence of the ultimate particle
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All matter is composed of atoms
Atoms cannot be made or destroyed
All atoms of the same element are identical
Different elements have different types of atoms
Chemical reactions occur when atoms are rearranged
Compounds are formed from atoms of the constituent elements -
proved the law of conservation of mass
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Proposed the Low of Constant compositon-pure compound always contain the same elements in the same mass proportion.
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Proposed the law of Multiple Proportions;pictured the atom as small industrutible particle wiht no internal structure.
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states that a chemical compound always contains exactly the same proportion of elements by mass.
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statement that when two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers
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Discovered negativly charged electrons, proposed the "Plum Pudding" model of the atom.
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is a vacuum tube containing one or more electron guns (a source of electrons or electron emitter) and a fluorescent screen used to view images
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atom model
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determined the unit charge of the electron. His discovery allowed for the calculation of the electron and all positively charged atoms.
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determined the size of the charge on an electron.
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to determine the layout of an atom
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published an atomic theory in which the atom has a central positive nucleus surrounded by negative orbiting electrons.
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model of the atom
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applied the quantum theroy to Rutherford's atomic structure and discovered a method of calculating the possible energy levels of stationary electrons. He also discovered that an emission of light occurs when an electron moves into a differnet energy level orbit.
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depicts the atom as small, positively charged nucleus surrounded by electrons that travel in circular orbits around the nucleus
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DIscovered that electrons could behave as waves under certain conditions.
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wherein electrons are no longer depicted as particles moving around the nucleus in a fixed orbit
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Developed the Shrodinger equation, can be used to predict the properties reactivities of all atoms and molecules, led to the atomic cloud model
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Discovered the Heisenburg Uncertainty Principle, the momentum and position of a particle cannot be simultaneously measured with high precision.
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is any of a variety of mathematical inequalities asserting a fundamental limit to the precision
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Confirmed the existence of the neutron.
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that mass is neither created or destroyed in ordinary chemical and physical changes.
