Organic chemistry part 1 Structure of an atom

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Organic chemistry part 1 Structure of an atom
2012-01-10 19:14:55

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  1. Protons
    positive charge, inside of the nucleus
  2. neutrons
    neutral charge, inside of the nucleus
  3. electrons
    negative charge, outside of nucleus (cloud)
  4. NOTE: The charge depends on the sharing of electrons. Giving up electrons leads to a positive charge and gaining electrons leads to a negative. The number of protons in an atom remains unchanged.
  5. Atomic number of an atom
    the number of protons in its nucleus as well as the number of electrons that surround the nucleus of a NEUTRALLY CHARGED atom
  6. What is the atomic number of carbon?
  7. Mass number of an atom
    the sum of its protons and neutrons
  8. Isotopes have the same atomic number (same number of protons) but different mass numbers bc they have different numbers of neutrons.

    Examples of isotopes?
    • 12C (6 protons, 6 neutrons)
    • 13C (6 protons, 7 neutrons)
  9. 14C
    • Naturally occuring carbon contains trace amounts of it
    • Radioactive
    • Half life (the time it take for one half of the nuclei to decay) is 5730
  10. Atomic Weight of a naturally occuring element
    the average mass of its atoms.
  11. Getting the atomic weight of Carbon
    • (0.9889*12.0000) + (0.0111*13.0034) = 12.011
    • We got this because we are going of the average mass of its atoms. These atoms are 12C, which has12.000 amu and makes up 98.89% of naturally occuring atoms and 13C, which has 13.0034 amu and makes up 1.11% of naturally occuring carbon.
  12. Atomic Mass Unit
    exactly 1/12 of the mass of 12C (whose atomic mass is 12). Therefore carbon would contain 12 atomic mass units.
  13. Molecular Weight of a compound
    the sum of the atomic weights of all the atoms in the molecule