Mass defect of a nucleus

  • #1

Main Question or Discussion Point

What is the mass defect of the 15N nucleus?

My attempt:

15-7=8
7(1.008665)+8(1.0078225)-14.003074
=1.120161

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
 

Answers and Replies

  • #2
alxm
Science Advisor
1,842
9
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.
 

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