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He discovered that atoms contained negatively and positively charged particles called electrons.
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All matter consists of tiny particles called atoms
Atoms could not be divided.
Atoms of the same element were alike.
Atoms combined in simple whole number ratios. -
Rutherford proposed that the atom consisted mostly of empty space and a dense nucleus containing positive charges
Negative charges orbited around the nucleus -
Bohr modified the model of the atom by suggesting that electrons orbit the nucleus at different energy levels.
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The nucleus contained protons and neutrons and the electrons spun around the outside. he also found that Neutrons are neutral.
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Democritus suggested that that all substances were made of tiny particles called atoms.
Essentially, Democritus discovered matter. Democritus believed that atoms made up everything and between atoms was invisible space.
