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He believed in the four elements of air, earth, water, and fire. He felt that regardless the number of times you cut a form of matter in half, you would always have a smaller piece of that matter.
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Believed in 5 key ideas about the atom:
1. All matter is composed of atoms, which are bits of matter too small to be seen. These atoms cannot be further split into smaller portions.
2. There is a void, which is empty space between atoms.
3. Atoms are completely solid.
4. Atoms are small homogeneous, with no internal structure.
5. Atoms are different in their size, shape, and weight. -
Invented the analytical balance and showed that elements could not be distroyed.
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Found the law of definite proportions, stating that when compounds are analysed into their constituted parts they always contain the same proportions of their elements by weight.
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Found the atom to be the smallest particle of matter that takes part in a chemical reaction. He also proved it cannot be created or destroyed.
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He studied effects of electricity on solution. Also found the term electolysis, which are the splitting of molecules with electricity. But he himself was not a proponent.
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Marie Curie helped to find a way to get the atomic mass of an atom. She also discovered that the atom was indivisible and unchangeable.
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Found that most atoms are not radioactive. Also neuclei are stable and atoms allow objects to stay the same.
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Discovered the electron. Quoted that the atom is filled with electrons. Created a model also known as the "Plum Pudding Model".
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Used the idea of quanta to explain hot glowing matter. Showed that light must be emitted and absorbed in discrete amounts if it was to correctly describe observed phenomena.
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Published the equation E=mc^2.
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Discovered that the atom was filled with the empty space. Also found that it contained a small nucleus.
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Developed the oil-drop experiment. Hypothesized that the mass of a single elect.ron was at least 1000 times smaller than that of the smallest atom
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Built a model made up of successive orbital shells of electrons. Developed an explanation of atomic structure that uderlies regularities of the periodic table.
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Started with the completion of atomic shells. Added a spin quantum numbers. Two electrons in an atomic structure can never have all four quantum numbers in common.
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Worked on the electronic structure of atoms and molecules. Known for Hund's Rules.
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Discovered the uncertainty principle and explained ferromangnetism based on the atomic structure.
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Atoms contain neutral particles called neutrons in their nucleus along with subatomic particles.
