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discovered electrons travel in orbitals or energy levels

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oil drop test- mass of electrons

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Gold foil experiment - atoms are mostly empty space - nucleus has a positive charge & all the mass

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atoms are particles - undividable - specific ratio

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mass balance- discovered the neutron

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found negativity charged participial called electrons

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Electrons A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Protons- a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

Neutrons- a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

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He basic unit of a chemical element.