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  2. Template:Atomic mass - Wikipedia

    en.wikipedia.org/wiki/Template:Atomic_mass

    The mass of an atom or a molecule is referred to as the atomic mass. The atomic mass is used to find the average mass of elements and molecules and to solve stoichiometry problems. The name "atomic mass" is used for historical reasons, and originates from the fact that chemistry was the first science to investigate the same physical objects on ...

  3. Atomic mass - Wikipedia

    en.wikipedia.org/wiki/Atomic_mass

    The atomic mass of atoms, ions, or atomic nuclei is slightly less than the sum of the masses of their constituent protons, neutrons, and electrons, due to (per E = mc 2). Atomic mass is often measured in dalton (Da) or unified atomic mass unit (u). One dalton is equal to 1 ⁄ 12 the mass of a carbon-12 atom in its natural state.

  4. Template:Chem molar mass/format - Wikipedia

    en.wikipedia.org/wiki/Template:Chem_molar_mass/...

    Atomic number Element Molar mass Formal standard atomic weight s.a.w., formal short Note Z calculated; g·mol −1 A r, standard [2] A r, abridged and conventional [2]; C 9 H 8 O 4: 180.159 g·mol −1

  5. Template : Infobox element/standard atomic weight/value ...

    en.wikipedia.org/wiki/Template:Infobox_element/...

    Substantial deviations in atomic weight of the element from that given in the table can occur. r [mini-title] Range in isotopic composition of normal terrestrial material prevents a more precise standard atomic weight being given; the tabulated value and uncertainty should be applicable to normal material.

  6. 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.

  7. Dalton (unit) - Wikipedia

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

    In 1803 John Dalton proposed to use the (still unknown) atomic mass of the lightest atom, hydrogen, as the natural unit of atomic mass. This was the basis of the atomic weight scale. [13] For technical reasons, in 1898, chemist Wilhelm Ostwald and others proposed to redefine the unit of atomic mass as ⁠ 1 / 16 ⁠ the mass of an oxygen atom. [14]

  8. Standard atomic weight - Wikipedia

    en.wikipedia.org/wiki/Standard_atomic_weight

    The standard atomic weight (A r °(Cu)) for copper is the average, weighted by their natural abundance, and then divided by the atomic mass constant m u. [ 1 ] The standard atomic weight of a chemical element (symbol A r °(E) for element "E") is the weighted arithmetic mean of the relative isotopic masses of all isotopes of that element ...

  9. Template:Atomic mass/doc - Wikipedia

    en.wikipedia.org/wiki/Template:Atomic_mass/doc

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