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Law of Conservation, The law states that matter cannot be made or destroyed.He began the conversation on what an atom was exactly.
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Law of Definite Proportions, states that the ratio of elements in a compound is always the same/constant. belived matter could be put together in certain patterns to make bigger, different, unique matter. He set it up for Dalton to create the Law of Multiple Proportions
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6 parts to is theory was...mtter is composed of extremely small particles called atoms..atoms are indivisible and indestructable..atoms of a given element are identical in size, mass, and chemical properties..atoms of specific elements are different thatn those of other elements..in a chemical reaction, atoms separate, combine and/or rearrange
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an English scientist who contributed to the fields of electromagnetism and electrochemistry. His main discoveries include those of electromagnetic induction, diamagnetism and electrolysis
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she discovered that Therium also emitted radiation, and further, that the amount of radiation depended upon the amount of element present in the compound.she deduced that radioactivity does not depend on how atoms are arranged into molecules, but rather that it originates within the atoms themselves
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While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays.
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Thomson proposed a model, sometimes called the "plum pudding".... in which thousands of tiny, negatively charged corpuscles swarm inside a sort of cloud of massless positive charge. This theory was struck down by Thomson's own former student, Ernest Rutherford.
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Published the famous equation E=mc 2
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Millikan's oil-drop apparatus, was an experiment performed by Robert A. Millikan and Harvey Fletcher in 1909 to measure the elementary electric charge (the charge of the electron).
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he combined the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom.The Bohr model
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The gold foil experiment. consisted of shooting Alpha atoms into extremely thin gold foil and seeing where on the surrounding circular wall it hit. There was something in the center of the atoms, called the nucleus.
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he was a German theoretical physicist who originated quantum theory,
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he suggested that electrons didn't spiral into the nucleus, but orbit in different levels. This is called the bohr model, or the quantum model.
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he was a French physicist who made groundbreaking contributions to quantum theory. In his 1924 PhD thesis he postulated the wave nature of electrons and suggested that all matter has wave properties
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Chadwick discovered neutrons.They differed from alpha rays because they repelled considerable electrical forces that are in the nucleus of many heavy atoms.
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Conducted experiments verifying that heavy elements capture neutrons and form unstable products which undergo fission. This process ejects more neutrons continuing the fission chain reaction.
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He became one of the first to recognize that the uranium atom, when bombarded by neutrons, actually split.
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Synthesized 6 transuranium elements and suggested a change in the layout of the periodic table.
