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atomic mass
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atomic mass
The Columbia Encyclopedia, Sixth Edition
atomic mass the mass of a single atom , usually expressed in atomic mass units (amu). Most of the mass of an atom is concentrated in the protons and neutrons contained in the nucleus. Each proton or neutron weighs about 1 amu, and thus the atomic mass is always very close to the mass number (total number of protons and neutrons in the nucleus). Atoms of an isotope of an element all have the same atomic mass. Atomic masses are usually determined by mass spectrography (see mass spectrograph ). They have been determined with great relative accuracy, but their absolute value is less certain.
Author not available, ATOMIC MASS.,
The Columbia Encyclopedia, Sixth Edition 2008
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The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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Atomic Mass
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atomic mass number
atomic mass number (nucleon number) Number of...nuclear notation, such as 7 3 Li, the mass number is the upper number and the atomic number (the number of protons) is...Isotopes of an element have different mass numbers but identical atomic numbers.
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atomic mass unit
atomic mass unit (amu) Unit of mass used to compare relative atomic masses, defined as 1/12th the mass of the most abundant isotope of carbon, carbon-12 (6 electrons, 6 protons, and 6 neutrons). One amu is equal to 1.66033 × 10 −27 kg.
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atomic mass unit
atomic mass unit or amu, in chemistry and physics, unit defined as exactly 1/12 the...equal to approximately 1.66 × 10 -24 grams. Author not available, ATOMIC MASS UNIT. , The Columbia Encyclopedia, Sixth Edition 2008
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relative atomic mass
relative atomic mass (atomic weight; r.a.m.) Symbol A r . The ratio of the average mass per atom of the naturally occurring form of an element to 1/12 of the mass of a carbon–12 atom.
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