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- Matter is made of particles called atomos
- Atomos are solid and indivisible -Different atomos = different sizes and shapes
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-Atoms are neither created nor destroyed by a chemical reaction, but they may be rearranged
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-Discovered electrons with cathode ray experiment
-Developed "plum pudding" atomic model -
-Most of atoms mass in nucleus
-Nucleus = Positive charge
- Electrons = in fixed orbitals around the nucleus -
- "Planetary" Atomic Model. Nucleus is surrounded by electrons, which orbit at different energy levels.
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- Electron orbitals have different shapes
- Both particles and waves of energy at the same time
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