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Understanding Subatomic Particles in the Atom: Electrons, Protons, and Neutrons

Discover the key components of atoms - electrons, protons, and neutrons, their charges, masses, and locations within the nucleus. Learn about the fascinating discovery of the neutron by James Chadwick through experiments. Explore the significance of quarks and atomic number in neutral atoms. Gain insights into the composition and structure of atoms.

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Understanding Subatomic Particles in the Atom: Electrons, Protons, and Neutrons

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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

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