Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Mass defect of a nucleus

  1. Apr 27, 2009 #1
    What is the mass defect of the 15N nucleus?

    My attempt:


    the answer needs to be in u so i dont know if this makes a difference or not but for some reason it is not working
  2. jcsd
  3. Apr 27, 2009 #2


    User Avatar
    Science Advisor

    Why are you using the number 14.003074? That's the mass of 14N. The mass defect is the real mass (of 15N) minus the mass of the constituent neutrons and protons.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook