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Democritus hypothesized that atoms cannot be destroyed, differ in size, shape and temperature, are always moving, and are invisible. His
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His model was the picture of the atom.
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- All matter is made of atoms. Atoms are indivisible and indestructible.
- All atoms of a given element are identical in mass and properties
- Compounds are formed by a combination of two or more different kinds of atoms.
- A chemical reaction is a rearrangement of atoms.
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The different parts of the atoms.
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Discovered the electron. JJ also had a plum pudding model which is a obsolete scientific model of an atom.
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JJ used the plum pudding model to discover the electron.
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Robert Millikan measured the charge on an electron.
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Robert used the oil drop experiment to find the charge of an electron.
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He discovered Alpha and Beta rays and nearly the total mass of an atom is concentrated in a nucleus. Composed the nuclear atom.
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The model he used to find the atomic mass of an atom.
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Bohr discovered the atomic nucleus.
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Niels model to find the atomic nucleus.
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James Chadwick's model to discover the neutron.
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James discovered the neutron.
