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Was the first person to propose the idea that matter was not infinitely divisble. He believed matter was made up of tiny individual particles called atomos. YEAR: 460-370 BC
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One of the most influnetial greek phiolsophers rejected theory, because it didn't agree with his own ideas on nature. He did not belieed that the nothingess of empty space could exist. 384-322 BC
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leader of muslim faith dies.
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Was written by the patriots on this day.
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is recognized as the father of medrn chemistry. His experiments led to the law of the conservation of mass. He also defined the process of respiration.
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Introduced the law of definite proportions.
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All matter is composed of extremely small particles called atoms. all atoms of a given element are identical, having the same size, mass, and chemical properties. Modern atom theory
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relationship between the masses of the same volume of different gases (at the same temperature and pressure) corresponds to the relationship between their respective molecular weights.
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Invented cathode ray. Crooks was able to create the 4th state of matter which is Plasma.
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Experimented and found that atoms were broken down into subatomic particles. This is when the electron was found.
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Said that the penetrating radiation came from the uranium itself, without any need of excitation by an external energy source
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matter can gain or lose energy only in small, specific amounts called quanta.
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Famous for her work with radioactivity. Discovered radium, and Polonium.
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Discoved the charge of the electron, and developed a formula to find the mass of the electron.
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Developed a more modern and supported atom model, and figured out there is a nucleus in the middle of the atom.
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Proposed a quantum model for the hydrogen atom has only certain allowable energy states. Lowest is ground state, highest is excited state.
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Discovered that atoms of each element contain a unque postiive charge in their nuclei, and that the number of protons decided what element it was.
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facts about einsteinDeveloped the modern Theory of Realitivity. famous equation E=MC^2.
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proposed an idea that accounted for the fixed energy levels of Bohr's model. He said that electrons acted like waves.
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concluded that it is impossible to make any measurement on an object without disturbing the object- at least a little.
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furthered the wave-particle theory proposed by de Broglie. Derived an equation that treated the hydrogen aton's electron as a wave.
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Discovered that there was another sub atomic particle called the neutron. And that it's mass was the same as the proton.
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