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Proposed that atoms are tiny particles that make up matter.

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Some ideas Daltons atomic theory stated were: matter is composed of atoms, atoms are invisible, indestructable, in a chemical reaction atoms are separated, combined, or rearranged, and atoms of a specific element are different from those of another.

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discovered electrons and said that negatively charged electrons are embedded inside a positively charged body or atom.

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Came to the conclusion that most of the atom and ordinary matter is empty space. Found that the nucleus is made up of positively charged protons and electrically neutral neutrons.

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According to Gell-Mann protons, neutrons, and other fundamental particles were made up of quarks.