atomic mass. The average mass of an atom of an element, usually expressed in atomic mass units. The terms mass and weight are used interchangeably in this case. The atomic weight given on the periodic table is a weighted average of isotopic masses found in a typical terrestrial sample of the element.
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The total weight of a neutral atom relative to the atomic weight of oxygen, which is taken as 16.00.
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(R greutate atomica) The nominal atomic weight of an isotope is given by the sum of the number of neutrons and protons in each nucleus. The exact atomic weight differs fractionally from that whole number because neutrons are slightly heavier than protons and the mass of the nucleus is also affected by the binding energy
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ratio of the average mass of a chemical element`s atoms to some standard. Since 1961 the standard unit of atomic mass has been one-twelfth the mass ... [9 related articles]
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the average weight of an atom of an element, usually expressed relative to one atom of the carbon isotope taken to have a standard weight of 12.
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Weighted average of the masses of the constituent isotopes of an element; The relative masses of atoms of different elements.
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Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.
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<chemistry> The average weight of an atom of an element, i.e. The total mass of protons and neutrons in an atom. ... (09 Oct 1997) ...
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the sum of the masses of the constituents of an atom, expressed in atomic mass units (or daltons), in SI units (i.e., kilograms), or as a dimensionless ratio derived by comparing the mass to the mass of an atom of carbon-12, which is taken as 12.000. Abbreviated at wt.
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the mass of an atom, expressed in atomic mass units. For example, the atomic number of helium-4 is 2, the atomic mass is 4, and the atomic weight is 4.00026.
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The average weight (or mass) of all the isotopes of an element, as determined from the proportions in which they are present in a given element, compared with the mass of the 12 isotope of carbon (taken as precisely 12.000), that is the official international standard; measured in daltons.
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The average weight of an atom
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the average weight of an atom of an element, usually expressed relative to one atom of the carbon isotope taken to have a standard weight of 12.
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(at. wt., AW) Type: Term Definitions: 1. the mass in grams of 1 mol (6.02 ׀ 1023 atoms) of an atomic species; the mass of an atom of a chemical element in relation to the mass of an atom of carbon-12 (12C), which is set equal to 12.000, thus a ratio and therefore dimensionless (although the actual mass, numerically the same, is ...
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Combined weight of an atom's electrons, protons, and neutrons.
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In chemistry, atomic weight is the relative weight of an atom referred to carbon, whose weight has been arbitrarily set at 12.01115.
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The average weight of an atom.
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[
n] - (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon-12
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The weighted average mass of the atoms in a naturally occurring element. See also: Atom, Atomic Mass Unit, Atomic Number, Molecular Weight.
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The nominal atomic weight of an isotope is given by the sum of the number of neutrons and protons in each nucleus. The exact atomic weight differs fractionally from that whole number because neutrons are slightly heavier than protons and the mass of the nucleus is also affected by the binding energy.
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relative atomic mass noun (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon
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Another name for relative atomic mass
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The sum of the weights of an atom's protons and neutrons, the atomic weight differs between isotopes of the same element.
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the weight in grams of one mole of the chemical element; approximately the number of protons and neutrons in the nucleus.
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the average weight of an atom of an element, formerly based on the weight of one hydrogen atom taken as a unit or on the weight of an oxygen atom, but after 1961 based on the weight of the carbon-12 atom. Abbr.: at. wt.
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