You're very close! There's a small error in the isotope names.

* Nitrogen-14 (N-14) is the more abundant isotope.

* Nitrogen-15 (N-15) is the less abundant isotope.

Here's why:

* The atomic mass of nitrogen is 14.007, which is very close to 14. This indicates that the heavier isotope, Nitrogen-15, is present in a smaller amount.

* If Nitrogen-14 were less abundant, the average atomic mass would be closer to 15.

Let me know if you have any other questions!