Atomic Structure and Periodic Table

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• The particles constituting an atom are the electron, the proton, and the neutron.
• An atom is composed of two regions: the nucleus, which is in the center of the atom and contains protons and neutrons, and the outer region of the atom, which holds its electrons in orbit around the nucleus.
• Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams, which scientists define as one atomic mass unit (amu) or one Dalton.
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Last Updated: Dec 1, 2022
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