thumb|right|upright=2.3|Table of nuclides (Segrè chart) from carbon to fluorine (including nitrogen). Orange indicates proton emission (nuclides outside the proton drip line); pink for positron emission (inverse beta decay); black for stable nuclides; blue for electron emission (beta decay); and violet for neutron emission (nuclides outside the neutron drip line). Proton number increases going up the vertical axis and neutron number going to the right on the horizontal axis. Nitrogen has two stable isotopes: 14N and 15N. The first is much more common, making up 99.634% of natural nitrogen, and the second (which is slightly heavier) makes up the remaining 0.366%. This leads to an atomic weight of around 14.007 u.Greenwood and Earnshaw, pp. 411–12 Both of these stable isotopes are produced in the CNO cycle in stars, but 14N is more common as its proton capture is the rate-limiting step. 14N is one of the five stable odd–odd nuclides (a nuclide having an odd number of protons and neutrons); the other four are 2H, 6Li, 10B, and 180mTa.
thumb|right|upright=23|Table of nuclides (Segrè chart) from carbon to fluorine (including nitrogen) Orange indicates proton emission (nuclides outside the proton drip line); pink for positron emission (inverse beta decay); black for stable nuclides; blue for electron emission (beta decay); and violet for neutron emission (nuclides outside the neutron drip line) Proton number increases going up the vertical axis and neutron number going to the right on the horizontal axis Nitrogen has two stable isotopes 14N and 15N The first is much more common making up 99634% of natural nitrogen and the second (which is slightly heavier) makes up the remaining 0366% This leads to an atomic weight of around 14007 uGreenwood and Earnshaw pp 411–12 Both of these stable isotopes are produced in the CNO cycle in stars but 14N is more common as its proton capture is the rate-limiting step 14N is one of the five stable odd–odd nuclides (a nuclide having an odd number of protons and neutrons); the other four are 2H 6Li 10B and 180mTa