Noun
English Wikipedia has an article on:nitrogen-14Wikipedia
nitrogen-14 (uncountable)
(physics) A stable isotope of nitrogen, 7N, having seven protons and seven neutrons; it accounts for over 99% of the natural element.
A given atom has an atomic mass approximately equal (within 1%) to its mass number times the atomic mass unit (for example the mass of a nitrogen-14 is roughly 14 u). Source: Internet
One example of this decay is carbon-14 (6 protons, 8 neutrons) that decays to nitrogen-14 (7 protons, 7 neutrons) with a half-life of about 5,730 years. Source: Internet
When the cycle is run to equilibrium, the ratio of the carbon-12/carbon-13 nuclei is driven to 3.5, and nitrogen-14 becomes the most numerous nucleus, regardless of initial composition. Source: Internet