Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The major stable isotope of nitrogen, 147N, having seven protons and seven neutrons; it accounts for well over 99% of the natural element.

Etymologies

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Examples

  • Nitrogen exists as two stable isotopes, nitrogen-14 (14N) and nitrogen-15 (15N) that can be separated by chemical exchange or by thermal diffusion.

    Nitrogen

  • The difference is that carbon-14 has 6 protons and 8 neutrons, while nitrogen-14 has 7 protons and 7 neutrons neutrons, remember, have near-enough the same mass as protons.

    THE GREATEST SHOW ON EARTH

  • As the centuries go by, the carbon-14 in the corpse, or lump of wood, or piece of cloth, or whatever it is, steadily decays to nitrogen-14.

    THE GREATEST SHOW ON EARTH

  • It decays rather rapidly, with a half-life of 5,730 years, as we have seen, to nitrogen-14.

    THE GREATEST SHOW ON EARTH

  • The combinations of these ratios things like the ratio of nitrogen-15 to nitrogen-14, as well as the fact that the gas trapped in the rock matches the Martian atmosphere, represent an irrefutable fingerprint proving that these materials originated on Mars.

    The Case for Mars

  • They fed the plant nematodes loaded with the isotope nitrogen-15, atoms of which have one more neutron than regular nitrogen-14.

    Yahoo! News: Business - Opinion

  • Nitrogen exists as two stable isotopes, nitrogen-14 (14 N) and nitrogen-15

    Featured Articles - Encyclopedia of Earth

  • Nitrogen-15 is a nonradioactive isotope of nitrogen that contains one more neutron than regular nitrogen (nitrogen-14) and can be used as a tracer for the incorporation of the element.

    R&D Mag - News

  • The group now wants to determine the ratio of nitrogen-14 and nitrogen-15 isotopes for individual sources of nitric oxides, including lightning, biomass burning, bacterial "fixing" of nitrogen, and fossil fuel burning.

    innovations-report

  • Tests showed the ratio of the nitrogen-15 isotope to the more common nitrogen-14 isotope had changed from pre-industrial times to the present.

    innovations-report

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