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Figure 1. Two stable isotopes of nitrogen occur naturally.
Close-up of atomic nitrogen-14 isotope illustration
Figure 1. Two stable isotopes of nitrogen occur naturally. They have the same number of protons (i.e., atomic number = seven), but different numbers of neutrons (seven and eight). Scientists understand the ratio of nitrogen atoms in the atmosphere, and can compare measurements elsewhere to learn about physical and biological processes as well as the origin of nitrogen particles.
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