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26 sie 2024 · Consider oxygen, which has an atomic number (\(Z\)) of 8. This means that oxygen atoms have 8 protons. Most atoms of oxygen also have 8 neutrons. Oxygen atoms with 8 neutrons would have a mass number of 16 (8 \(\mathrm p^+\) + 8 \(\mathrm n^0\)), meaning they would have a mass of about 16 amu.
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Figure 5.5c: Oxygen-18 Atom: The isotope, oxygen-18, includes 8 protons and 10 neutrons in the core nucleus, and 8 electrons around the nucleus. (credit: work by SM358, PD).
Natural nitrogen (7 N) consists of two stable isotopes: the vast majority (99.6%) of naturally occurring nitrogen is nitrogen-14, with the remainder being nitrogen-15. Thirteen radioisotopes are also known, with atomic masses ranging from 9 to 23, along with three nuclear isomers.
Nitrogen has two naturally occurring isotopes, nitrogen-14 and nitrogen-15, which can be separated with chemical exchanges or thermal diffusion. Nitrogen also has isotopes with masses of 12, 13, 16, and 17, but they are radioactive. Nitrogen 14 is the most abundant form of nitrogen and makes up more than 99% of all nitrogen found on Earth.
Atoms of the same element that contain the same number of protons, but different numbers of neutrons, are known as isotopes. Isotopes of any given element all contain the same number of protons, so they have the same atomic number (for example, the atomic number of helium is always 2).
•Nitrogen, along with K and P, is a key macronutrient •Plays a fundamental role in energy metabolism and protein synthesis •Comprises ~4% of the dry weight of plants and ~3% of animals
List, data and properties of all known isotopes of Nitrogen. The natural nitrogen that surrounds us consists of the stable isotopes 14 N (> 99.5%) and 15 N (< 0.4%). The CNO cycle of stellar nucleosynthesis is assumed to be the source of the 14 N-nuclide.
