MeSH definition : Stable nitrogen atoms that have the same atomic number as the element nitrogen, but
differ in atomic weight. N-15 is a stable nitrogen isotope.; Stable nitrogen atoms that have the same atomic number as the element nitrogen but
differ in atomic weight. N-15 is a stable nitrogen isotope.;
Stable nitrogen atoms that have the same atomic number as the element nitrogen, but
differ in atomic weight. N-15 is a stable nitrogen isotope. Stable nitrogen atoms that have the same atomic number as the element nitrogen but
differ in atomic weight. N-15 is a stable nitrogen isotope.