Atomic Physics - rest mass of Deuterium

  1. 1. The problem statement, all variables and given/known data

    Calculate the rest mass of Deuterium nucleus.

    2. Relevant equations

    Is it correct to calculate its mass using hydrogen?
    i.e. 2*rest mass of hydrogen?..

    3. The attempt at a solution

    As stated in text book,
    the rest mass of deuterium = 3.34330*10^-27 kg

    If it is calculated from hydrogen (my "theory" as above) = 2*(1.67338*10^-27) = 3.34676*10^-27 kg

    My question is..
    Is my theory correct or there is something wrong with my concept?..
    Is there any correct ways to find out the mass of deuterium without looking from textbook's data?

    Thank you!
  2. jcsd
  3. I think the problem arises in the fact that a Deuterium nucleus is a Proton and a Neutron, not 2 Protons, and the masses are slightly different.
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