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| law of conservation of matter |
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Definition
| states that matter cannot be created or destroyed |
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| French tax collector who was decapitated during the French Revolution and came up with the law of conservation of matter |
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| law of definite proportions |
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| states that elements in a compound always occur by mass in same ratios |
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| English-Quaker, unmarried, schoolteacher whose hobby was studying the weather, lived in the country and developed the atomic theory |
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| law of constant composition |
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Definition
| states that compositions of compounds is constant based on number of atoms |
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| Cathode Ray Tube Experiment |
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Definition
| experiment in which Thomson filled a cathode ray tube with gas and plugged it into a battery. When he put a magnet at the top of tube, the gas would moved downward. |
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| plum pudding model of the atom |
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Definition
| model showing that negative electrons were spread evenly throughout the positive charge of the rest of the atom |
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| another name for an electron |
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| an extremely tiny, negatively charged particle |
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| a positively charged particle located in the nucleus |
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| a particle with no charge, located in the nucleus |
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| discovered radioactivity. Had ore with uranium in it. He stuck it in a drawer on top of a photographic film and a key and locks it. Key is imprinted on film. |
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| Polish scientist who marries a brilliant woman. He dies in an accident. |
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| born in Poland. Sent to Paris to go to school for science. Gets master's degree and ends up in Becquerel's lab. Discovered that atoms can change. Two elements were named after this person. |
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| these two elements were named after Marie Curie. |
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| this had 2 neutrons/2 protons/no electrons. it had a positive charge and a helium nucleus. |
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| this had high energy and invisible light. |
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| symbol for alpha particle |
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| famous for his gold foil experiment in which he discovered the nucleus |
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| the center of an atom in which protons and neutrons are located; small, dense, contains all mass, positive charge |
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| Ernest Rutherford's lab assistant |
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| experiment performed by Rutherford which demonstrated the fact that there is a nucleus |
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| mass of element/mass of compound x 100=% composition |
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| the formula for percent composition |
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| American who discovered the charge on an electron. Had the oil drop experiment. |
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| force that allows protons & neutrons to be close together |
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| different varieties of atoms of the same elements |
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| number of protons + number of neutrons |
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| C-12, C-13, C-14: what are these examples of? |
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