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The atom cannot be destroyed, differ in size, shape, and temperature, are always moving, and are invisible
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Aristotle was well read in many fields but didn't believe in the atomic theory, he believed everything was made of earth, wind, water, and fire.
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HE invented the barometer, was considered the father of hydrodynamics, and improved the telescope
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Discovered and named oxygen and hydrogen. he declined that gasses had a negative weight.
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Made the law of constant composition which states that a compound has a mass of the sum of its parts.
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Theorized that atoms had a heavy nucleus and tried to prove this with his famous gold foil experiment.
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Theorized that energy is only transferred in certain quantities. Electrons only move in certain orbits.
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Discovered the electron cathode ray tube and used it to prove atoms were divided into electrons, protons, and neutrons
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Developed an equation to find the orbit of electrons.
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Worked with quantum theory predicting wave nature of electrons and he won a Nobel prize.
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Added Quantum mechanics to figure out the behavior of elementary particles.