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I Mass different for neutrons?

  1. Jun 6, 2017 #1
    My physics is not good, please kindly don't judge my physics.
    In some molecular weight calculator to get mono-isotope neutral mass for atoms listed below.
    In FTICR, we could find these difference. For example,
    m/z 101.960035, ^1H^35Cl^16O3^18O
    m/z 101.952838, ^1H^37Cl^16O4
    Here is my question. Do neutrons have different mass and why or good explanations?

    16^O 15.994915
    18^O 17.999161
    difference 2.004246
    35^Cl 34.968853
    37^Cl 36.965903
    difference 1.99705
  2. jcsd
  3. Jun 6, 2017 #2


    User Avatar

    Staff: Mentor

    All neutrons have the same mass, as do all protons. However, if you take two or more of these particles and bring them together in an atomic nucleus, some energy will be released and because of Einstein's ##E=mc^2## the mass of the nucleus will be less than the mass of the individual nucleons (neutrons and protons) of which the nucleus is composed.

    If you google for "binding energy" you will find a bunch of more detailed explanations and examples.
    Last edited: Jun 7, 2017
  4. Jun 7, 2017 #3
    Thanks a lot. This is what I search for.
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