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There was mass of insanely small size everywhere.
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The name of his model was the Atomus, he knew nothing was smaller than an atom and an atom couldn’t be divided.
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The name of his model was the solid sphere model. His idea was all elements were made of same atoms and mass.
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He created the first periodic table and the elements were sorted by atomic mass.
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His model was the plum pudding model, it had a sphere of positive charges with negative charges spread throughout.
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The name of his model was the nuclear model. He believed all atoms were empty space except for the nucleus which was dense and made up the atom.
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He discovered the number of protons is different in each element, which makes the atomic number different.
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He gave his model the name “Bohr’s model”, this stated that electrons are negative particles that orbit the nucleus at different levels.
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This was the electron cloud model, it showed that the nucleus is surrounded by an electron cloud where the electrons travel but not on a set orbit.
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He discovered the neutron and this contributed to the creation of the atomic bomb and nuclear fission
