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atomic mass

[uh-tom-ik mas]

Phonetic (Standard)IPA

noun

Chemistry.

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 1/16 (0.0625) the mass of one oxygen atom, but after 1961 based on 1/12 (0.0833) the mass of the carbon-12 atom.

atomic mass

noun

the mass of an isotope of an element in atomic mass units
short for relative atomic mass See atomic weight

atomic mass

The mass of a given atom or molecule, expressed in atomic mass units.
Compare atomic weight See also mass number

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Word History and Origins

Origin of atomic mass¹

First recorded in 1895–1900

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Example Sentences

Examples have not been reviewed.

Since each of these 17 elements has a unique atomic mass — for example, only lead has an atomic mass of 0.34 trillion billionths of a gram — BSK could then determine the concentration of the metals.

From

"Many thousands of atomic nuclei that have yet to be measured may exist in nature," said Matthew Mumpower, a theoretical physicist and co-author on several recent papers detailing atomic masses research.

From

The team was able to determine that the r-process can produce atoms with an atomic mass of at least 260 before they fission.

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Wallner is particularly interested in the radioactive iron isotope with the atomic mass of 60.

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Twelve, named for the atomic mass of carbon, has developed a process to make jet fuel using renewable electricity, water and waste biomass CO2 instead of fossil fuels.

From

atomicity atomic mass unit

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