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Noob chemistry question.

  1. Aug 9, 2010 #1

    what does the following means.


    and it says that a He nucleus has mass of 6.4*10-27 Kg

    how would i calculate the mass of 4He

    do i take mass of 4He to be 6.4*10-27 Kg?

    help, haven't done chemistry after getting out of school..i only do physic..in uni

    thanks in advance
  2. jcsd
  3. Aug 9, 2010 #2


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    4He means Helium-4, the Helium isotope with atomic number 4 (two protons, two neutrons). As opposed to Helium-3 (two protons, one neutron) for instance.
  4. Aug 9, 2010 #3
    i see thanks for the help
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