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Particles in the Atom. Electrons (-) charge no mass located outside the nucleus Protons (+) charge 1 amu located inside the nucleus Neutrons no charge 1 amu located inside the nucleus. +. Discovery of the Neutron. +.

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Particles in the Atom


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    1. Particles in the Atom Electrons (-) charge no mass located outside the nucleus Protons (+) charge 1 amu located inside the nucleus Neutrons no charge 1 amu located inside the nucleus

    2. + Discovery of the Neutron + James Chadwick bombarded beryllium-9 with alpha particles, carbon-12 atoms were formed, and neutrons were emitted. *Walter Boethe Dorin, Demmin, Gabel, Chemistry The Study of Matter 3rd Edition, page 764

    3. Subatomic particles Actual mass (g) Relative mass Name Symbol Charge Electron e- -1 1/1840 9.11 x 10-28 Proton p+ +1 1 1.67 x 10-24 Neutron no 0 1 1.67 x 10-24

    4. QUARKS equal in a neutral atom Atomic Number equals the # of... Most of the atom’s mass. Subatomic Particles ATOM NUCLEUS ELECTRONS NEUTRONS PROTONS Negative Charge Positive Charge Neutral Charge Courtesy Christy Johannesson www.nisd.net/communicationsarts/pages/chem