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He contributed to the modern atomic theory that he used that an atom is indivisible.
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He contributed to the modern atomic theory that an atom is divisible.
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He contributed to the modern atomic theory that substances are made of atoms. Matter is composed by atoms.
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He contributed to the modern atomic theory that there is a smaller particle inside of an atom called electron.
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He contributed to the modern atomic theory that electron have a negative charge and they are present in all atoms.
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He contributed to the modern atomic theory that inside an atom there is a positive charge particle called a proton and all atoms have a nucleus.
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He contributed to the modern atomic theory that electrons are in orbits. The orbits are per levels around the nucleus that the electrons use to jump.
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He contributed to the modern atomic theory that the atoms of each element contain a unique positively charge in their nuclei. The atomic number is equal to the number of protons.
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He contributed to the modern atomic theory that inside an atom’s nucleus also exists a no charge particle called neutron.