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Questions about atoms

  1. May 10, 2009 #1

    fluidistic

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    How did we know that the more common isotope of iron has 26 protons and 30 neutrons?
    I'm asking a general question so the iron example is just a special case.
    How did we know that oxygen has 8 protons? (and 8 neutrons), and also that the 8 neutrons is the most stable isotope and that there exists other isotopes in smaller quantities. How did we determine the quantities of the isotopes?
     
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  3. May 10, 2009 #2

    malawi_glenn

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    mass spectroscopy = charge vs. mass
     
  4. May 10, 2009 #3

    fluidistic

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    Thanks a lot. I wasn't aware of this.
     
  5. May 11, 2009 #4

    malawi_glenn

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  6. May 11, 2009 #5

    fluidistic

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