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Dictionary

atom'ic mass' u"nit

Physics.
1. Also called dalton. a unit of mass, equal to ¹/12 the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles.
2. (formerly) a unit of mass, equal to ¹/16 the mass of an oxygen atom having atomic mass 16. Abbr.: amu, AMU

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

atomic mass

atomic number

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