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In 460 BC, Democritus concluded that everything is made up of atoms.
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Dalton discovered the Atomic Theory;
1. All matter is made of atoms that can be combined
2. Atoms of the same elements are exactly alike
3. Atoms of different -
Discovered that atoms were not simple solid spheres. He discovered electrons, small particles located outside the nucleus and have a negative charge.
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He came up with E=mc2.
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He came up with the name of the center the nucleus. He had concluded that the positively charged particles are in the nucleus and the negatively charged particles are around the nucleus.
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Borh proposed that electrons orbit around the nucleus.
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He discovered the behavior of electrons. Said that you can’t know both the exact position and momentum of an electron
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Came up with the idea that not only positively charge particles were in the nucleus.
