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Atomic mass - Wikipedia Atomic mass (ma or m) is the mass of a single atom The atomic mass mostly comes from the combined mass of the protons and neutrons in the nucleus, with minor contributions from the electrons and nuclear binding energy [1] 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 mass defect
Standard atomic weight - Wikipedia When the term "atomic weight" is used in chemistry, usually it is the more specific standard atomic weight that is implied It is standard atomic weights that are used in periodic tables and many standard references in ordinary terrestrial chemistry Lithium represents a unique case where the natural abundances of the isotopes have in some cases been found to have been perturbed by human
Relative atomic mass - Wikipedia Relative atomic mass (symbol: Ar; sometimes abbreviated RAM or r a m ), also known by the deprecated synonym atomic weight, is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a given sample to the atomic mass constant
Atom - Wikipedia This number was chosen so that if an element has an atomic mass of 1 u, a mole of atoms of that element has a mass close to one gram Because of the definition of the dalton, each carbon-12 atom has an atomic mass of exactly 12 Da, and so a mole of carbon-12 atoms weighs exactly 0 012 kg
Glossary of chemistry terms - Wikipedia This glossary of chemistry terms is a list of terms and definitions relevant to chemistry, including chemical laws, diagrams and formulae, laboratory tools, glassware, and equipment Chemistry is a physical science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions; it features an extensive vocabulary and a
Molar mass constant - Wikipedia The molar mass constant, usually denoted as Mu, is a physical constant defined as 1 12 of the molar mass of carbon-12: Mu = M(12C) 12 ≈ 1 g mol, where M(12C) ≈ 12 g mol [1] The molar mass of a substance (element or compound) is its relative atomic mass (atomic weight) or relative molecular mass (molecular weight or formula weight
Molecular mass - Wikipedia The molecular mass (m) is the mass of a given molecule, often expressed in units of daltons (Da) [1] Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element The derived quantity relative molecular mass is the unitless ratio of the mass of a molecule to the atomic mass constant (which is equal to one dalton) [2] The
Chemical element - Wikipedia The standard atomic weight (commonly called "atomic weight") of an element is the average of the atomic masses of all the chemical element's isotopes as found in a particular environment, weighted by isotopic abundance, relative to the atomic mass unit [61]