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12 Cards in this Set
- Front
- Back
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Democritus
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said that all things contain matter and matter is made up of atoms and void, he also said that atoms are undivideable
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Dalton Theory
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he defined the atom having a uniformed density and being indivisible
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Law of conservation of mass
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matter/mass is neither created or destroyed by physical or chemical changes
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Law of definite proportions
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no matter the size of a sample, a chemical compound contains the same proportion % elements by mass
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Law of Multiple Proportions
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the same elements can combine in different rations to form different compounds
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Avagardo's Number
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the number of particles in one mole of a pure substance
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Atomic Number
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the # of protons in the nucleus for each atom of that element
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Mass Number
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total # of protons and neutrons
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isotopes
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are atoms of the same element that have different masses
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Millikan
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found out that electrons carrynegative electrical charges
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Chadwick
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discovered the neutron which he found to have no charge and wieghed roughly the same as the proton
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Average Atomic Mass
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is the weighted average of the atomic masses of the naturally occuring isotopes of an element
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