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11 Cards in this Set
- Front
- Back
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James Chadwick
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Discovered the neutron
through radioactivity through Baryllium - neutron has the same mass as the proton |
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Neils Bohr
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-Placed the electron traveling in orbits around the nucleus
- chemical properties are determined by the number of electrons orbiting the nucleus |
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Antoine Lavoisier
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Law of Conservation of Mass
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Joseph Proust
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Law of Constrant Composition and Law of Definite Proportions
- all samples of a pure compound contain the same elements in the same proption by mass (Every water has 2 O and 1 H) |
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John Dalton
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Wrote the Atomic Theory (used Antoine Lavoisier and Proust)
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Sir William Crookes
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Developed the cathode Ray Tube
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J.J. Thompson
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used cathode Ray Tube to find the mass/charge of and electron
- Plum Pudding model |
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Robert Milikin
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Oil Drop Experiment- mass of electrong and charge
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Ernest Rutherford
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- Gold foil experiment to discover the nucleus
-Discovered the Proton - found the proton is the same quantity but opposite charge of the electron. - used a modified version of the Cathode ray to discover it |
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Henry Moseley
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- properties of elements related to atomic number (the positive charge) instead of the atomic mass
- Amount of positive charges makes atoms different - Organized the periodic table by atomic number |
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Dalton's Atomic Theory
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1. Atoms make up all atoms
2. (atoms for a element are identical (isotopes)) Atoms for one element are different for others 3. (Atoms cannot be subdivided) created or destroyed 4. Atoms can combine to form whole number ratios to for compounds 5. In chemical reactions, atoms are combined, separated or rearranged. |
