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Subatomic Particles

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proton, neutron, electron, ion, isotope

proton, neutron, electron, ion, isotope

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  • 1. Subatomic Particles Names, Properties, and Locations Atomic mass and isotopic mass Ions by Lisa Allen
  • 2. Protons
    • Positive charge
    • Found in the nucleus
    • Mass of 1 AMU (atomic mass unit)
    • The number of protons in an atom is equal to the atomic number of that element. This is always true. So an atom of oxygen always has 8 protons, no matter what else about that atom is different. An atom with 11 protons is always sodium. ALWAYS.
  • 3. How many protons are there in...?
          • Uranium-238?
          • Carbon?
          • Zinc?
          • Gold?
          • Potassium ions?
          • Chlorine gas atoms?
          • Lithium found in pills?
          • Carbon found in CO 2 ?
  • 4. Neutrons
    • No charge
    • Found in the nucleus
    • Mass of 1 AMU (atomic mass unit)
    • The number of neutrons in an atom is equal to the atomic mass minus the atomic number of that element.
  • 5. How many neutrons are there in...?
          • Carbon atoms?
          • Sodium atoms?
          • Silver atoms?
  • 6. Average atomic mass and Isotopes
    • Question to show the point – How many kids are there in your family?
    • Average number may not be the number in any particular family!
    • Isotopes are atoms with a specific number of neutrons. They have the same number of protons, the same charge, but have a specific atomic mass.
    • Isotopes can be identified with 2 different notations
            • Hyphen notation: Carbon - 14
            • Nuclear symbol notation: 14 6 C (hard to type!)
    • To find the number of neutrons in an isotope, subtract the number of protons (atomic number) from the atomic mass.
  • 7. Finding the mass of an isotope
        • Add the number of protons and the number of neutrons
        • Practice?
        • What is the mass of the isotope of carbon with 8 neutrons?
        • What is the mass of the isotope of aluminum with 14 neutrons?
  • 8. Electrons Negative Charge Found in energy levels outside the nucleus Mass of 1/1836 AMU (almost nothing!) The number of electrons in a neutral atom is equal to the number of protons. The number of electrons in an ion is different from the number of protons .
  • 9. How many electrons are there in...?
          • Carbon?
          • Sodium +1 ion?
          • Uranium – 238?
          • Cl - ion?
          • O 2-
          • Magnesium?
          • Cobalt?
  • 10. Practice these!
    • http://chemistry2.csudh.edu/homework/hwintro.html
          • Go to  11
          • Get 10 right out of 12 or fewer attempts
          • Submit to LAllen
          • Print confirmation for your records
          • Submit confirmation