Subatomic Particles
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Subatomic Particles

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proton, neutron, electron, ion, isotope

proton, neutron, electron, ion, isotope

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    Subatomic Particles Subatomic Particles Presentation Transcript

    • Subatomic Particles Names, Properties, and Locations Atomic mass and isotopic mass Ions by Lisa Allen
    • 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.
    • 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 ?
    • 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.
    • How many neutrons are there in...?
            • Carbon atoms?
            • Sodium atoms?
            • Silver atoms?
    • 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.
    • 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?
    • 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 .
    • How many electrons are there in...?
            • Carbon?
            • Sodium +1 ion?
            • Uranium – 238?
            • Cl - ion?
            • O 2-
            • Magnesium?
            • Cobalt?
    • 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