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  2. Carbon-12 - Wikipedia

    en.wikipedia.org/wiki/Carbon-12

    Carbon-12 is of particular importance in its use as the standard from which atomic masses of all nuclides are measured, thus, its atomic mass is exactly 12 daltons by definition. Carbon-12 is composed of 6 protons , 6 neutrons , and 6 electrons .

  3. Atomic mass - Wikipedia

    en.wikipedia.org/wiki/Atomic_mass

    For comparison, the atomic mass of a carbon-12 atom is exactly 12 daltons. Alternately, the atomic mass of a carbon-12 atom may be expressed in any other mass units: for example, the atomic mass of a carbon-12 atom is 1.992 646 882 70 (62) × 10 −26 kg. As is the case for the related atomic mass when expressed in daltons, the relative ...

  4. Carbon - Wikipedia

    en.wikipedia.org/wiki/Carbon

    Carbon is a constituent (about 12% by mass) of the very large masses of carbonate rock (limestone, dolomite, marble, and others). Coal is very rich in carbon (anthracite contains 92–98%) [64] and is the largest commercial source of mineral carbon, accounting for 4,000 gigatonnes or 80% of fossil fuel. [65]

  5. Table of nuclides - Wikipedia

    en.wikipedia.org/wiki/Table_of_nuclides

    Examples include carbon-14, nitrogen-15, and oxygen-16 in the table above. Isobars are nuclides with the same number of nucleons (i.e. mass number) but different numbers of protons and neutrons. Isobars neighbor each other diagonally from lower-left to upper-right. Examples include carbon-14, nitrogen-14, and oxygen-14 in the table above.

  6. Dalton (unit) - Wikipedia

    en.wikipedia.org/wiki/Dalton_(unit)

    By definition, the mass of an atom of carbon-12 is 12 daltons, which corresponds with the number of nucleons that it has (6 protons and 6 neutrons). However, the mass of an atomic-scale object is affected by the binding energy of the nucleons in its atomic nuclei, as well as the mass and binding energy of its electrons. Therefore, this equality ...

  7. Isotopic signature - Wikipedia

    en.wikipedia.org/wiki/Isotopic_signature

    The atomic mass of different isotopes ... The ratio of carbon-13 and carbon-12 ... This variability can be used for approximate determination of geographic location ...

  8. Mass number - Wikipedia

    en.wikipedia.org/wiki/Mass_number

    The mass number gives an estimate of the isotopic mass measured in atomic mass units (u). For 12 C, the isotopic mass is exactly 12, since the atomic mass unit is defined as 1/12 of the mass of 12 C. For other isotopes, the isotopic mass is usually within 0.1 u of the mass number.

  9. Standard atomic weight - Wikipedia

    en.wikipedia.org/wiki/Standard_atomic_weight

    Between locations in the Solar System, the atomic weight of argon varies as much as 10%, ... Symbol A r is a relative atomic mass, ... carbon [12.0096, ...