The atomic mass (ma) is the mass of an atomic particle, sub-atomic particle, or molecule. It may be expressed in unified atomic mass units; by international agreement, 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom (at rest). When expressed in such units, the atomic mass is called the relative isotopic mass (see secti...
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the quantity of matter contained in an atom of an element. It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, ... [5 related articles]
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http://www.britannica.com/eb/a-z/a/120
is the average mass of the isoes of an element. It is the decimal number on the periodic chart. It depends upon both the isoes masses and the amount of each isoe present.
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http://www.chemicalglossary.net/definition/119-ATOMIC_MASS
the mass of an atom expressed in atomic mass units (amu); the total number of protons and neutrons in the nucleus.
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(Atomic Mass Average) The average mass of all nuclides of an element determined by the proportions in which each nuclide of the element are present within the earth and its atmosphere.
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The average mass of an atom of a given element. For elements with only one isotope, this mass is the same as the mass of each atom. However, for elements with more than one isotope, the atomic mass is the average mass for all the isotopes of the element. Related entries •...
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The mass of an isotope of an element expressed in atomic mass units, which are defined as one-twelfth of the mass of an atom of carbon-12.
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<chemistry, physics> The mass of an atom relative to other atoms. ... The present-day basis of the scale of atomic weights is carbon, the most common isotope of this element has arbitrarily been assigned an atomic weight of 12. ... The unit of the scale is 1/12 the weight of the carbon atom or roughly the mass of one proton or one neutron. Th...
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1. The sum of protons and neutrons in an atom's nucleus. 2. The combined mass of all the particles in a given atom.
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the mass of an atom expressed in atomic mass units (amu); the total number of protons and neutrons in the nucleus.
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The atomic mass represents the total number of Protons & Neutrons in an atom. For example, in the Carbon 14 atom shown above there are 6 (red) Protons and 8 (blue) neutrons packed into the nucleus. Therefore the atomic mass is 14 (and hence we write C-14).
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[
n] - (chemistry) the mass (in atomic mass units) of an isotope of an element
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noun (chemistry) the mass (in atomic mass units) of an isotope of an element
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The mass of a neutral atom of a nuclide. The atomic weight of an atom is the weight of the atom based on a scale where 12C = 12. The atomic weight of an element is the weighted average of each isotope.
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See relative atomic mass
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the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit or on the mass of one oxygen atom, but after 1961 based on the mass of the carbon-12 atom. Abbr.: at. m.
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