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John Dalton is the scientist credited for the atomic theroy. It states that the total mss present before a chemical reaction is the same as the total mass present after the chemical reaction 1766-1844
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Helped develop the metric system. Discovered mass and that it is the same in different forms.
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Advanced atomic theory, with solid masses in motion. Atoms cannot be created or destroyed.
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All matter is made of atoms. All atoms of a given elements are identical in mass and properties. Compounds are formed by a combination of two or more different kinds of atoms. A chemical reaction is a rearrangement of atoms.
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Discovered the periodic law.
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A vacuum tube in which a beam of electrons are focused to a small cross secion and varied in position and on a display surface.
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Discovered the electron. Described atoms as a ball of positive charge with a number of electron.
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Conducted the Oil Drop Experiment.
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J.J Thomson who discovered the electron. In this model, the atom is composed of electrons. Surrounded by positively charge to balance the negavtively charged.
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Visual model that maps the locations of electrons. Used to describe the locations of electrons around the nucleus.
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Was an experiment to probe the structure of an atom.
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The model of an atom by Ernest Rutherford. On the basis of experiments on the scattering of alpha particles.
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Justification to the atomic number and Moseley's law. This law advanced Chemistry by sorting elements in the periodic table in a more logical order.
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Niels Bohr proposed this model. The mordern model of the atom is based on quantum mechanics. Contains some errors. The negatively-charged electrons orbit a small, postively-charged nucleus.
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Father of quantum theory. Came up with the Bohr Planetary Model.
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Father of nucleus physics. Developed Gold Foil Experiment. Thought the nucleus of an atom was dense and a positive charge.
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Proposed, " Electron Cloud Theory" identified the electron cloud as the propable location of moving particles.
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Is the most recent model of the atom. Based on quantum mechanics, quantum numbers are quantum solutions to quantum equations. It's used to find the position and location of an electron.
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Found the atom. All atoms are indivisible. 400 B.C.
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Proved there was a neutron. Discovered a particle in the nucleus that has the same mass as a proton.
