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Specific charge

  1. Sep 4, 2013 #1
    Hello, i have recently started doing AS level physics and i don't understand specific charge.
    My textbook stated ' An ion of Magnesium isotope (24 nucleon number, 12 proton number) has a charge of +3.2 x 10(to the power of negative 19) Coulombs.
    The charge of a proton is : 1.60 x 10(to the power of negative 19)
    As the ion has 12 protons in the nucleus, why isn't the charge (1.60 X 10^-19) x 12?
    If anybody could explain it would be much appreciated:)
  2. jcsd
  3. Sep 4, 2013 #2


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    Hint: if it isn't an ion, the net charge would be zero. You are forgetting the electrons surrounding the nucleus.

  4. Sep 4, 2013 #3
    Ohh, so is the relative charge of the ion +2?
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