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21 Cards in this Set
- Front
- Back
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J.J Thomson
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the scientist who used a cathode ray tube to discover the electron
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Democritus
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the person who first thought, in 400 BC, that matter is made up of invisible particles
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Rutherford
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the scientist who discovered that there was something small, dense, and positive in an atom by using the gold foil experiment
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R.A. Millikan
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the scientist who calculated the charge and mass of the electron using an oil drop apparatus
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Mass Number
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the total amount of protons and neutrons in an atom
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atomic number
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the total amount of protons in an atom
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isotope
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atoms of the same element with different mass number, because they have different amounts of neutrons
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megameter (M)
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10 to the 6th power
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kilometer (k)
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10 to the 3rd power
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base unit
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10 to the 0 power
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decimeter
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10 to the -1st power
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centimeter
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10 to the -2nd power
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millimeter
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10 to the -3rd power
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micrometer
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10 to the -6th power
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nanometer
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10 to the -9th power
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picometer
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10 to the -12 power
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matter
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anything that takes up space and has mass
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atom
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the smallest unit of an element that maintains the properties of that element
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element
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a pure substance made of only one kind of atom
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compound
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substance that is made from the atoms of two or more elements that are chemically bonded
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physical property
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can be observer without changing the identity of the substance
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