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He thought everything were made up of small particles that were eternally invariable, each of which was called an atom. Also, he concluded that an atom can not be split indefinitely into smaller parts.
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He thought all elements are made up of very small, no more splitting particles, of the same shape and weight.
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He discovered electrons and isotopes and also analyzed the mass of atoms.
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He found a proton and he thought that there was an atomic nucleus at the center of the atom, and the electrons were rotating around it.
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He thought atoms are mostly empty space with a positively charged nucleus surrounded by electrons that rotate circular orbits.
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His model describes the probability that an electron can be found in a given region of space at a given time. It no longer tells us where the electron is, it only tells us where it might be.
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