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He found that Everything is composed of atoms, which are indestructible, and they will always be in motion
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All matter is made up of atoms, and atoms are indivisible and indestructible
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He found that atoms have electrons using CRT
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He determined the true nature of the atom, and the phenomenon of radioactivity. He also found that unstable nuclei emit alpha particles
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He found that all atoms of a certain element contain the same amount of protons
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He took the Bohr atom model and improved by using mathematical equations to describe the possibility of finding electrons in certain positions