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Believed that the elements fire, air, earth, and water make up all matter.
Not based on any scientific evidence.

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All atoms of the same elements had the same size and mass and atoms of the different elements had different size and mass.
Had uniform composition and were indivisible.

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Atoms are small negative charges floating in a "sea" of positive matter.
The plum pudding is an analogy for electrons in an atom.

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The nucleus, which is the atom's little, dense, and positively charged interior.
Established the theory using the gold foil experiment.

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Electrons were positioned in predictable circular orbits. The closer the electrons, the less energy they have.

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Electrons exist in orbitals.
Orbitals are regions where electrons are most likely to be found.