what is atomic mass?
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Answer:
the quantity of matter contained in an atom of an element
Explanation:
The observed atomic mass is slightly less than the sum of the mass of the protons, neutrons, and electrons that make up the atom
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The atomic mass is the mass of an atom. Although the SI unit of mass is the kilogram, atomic mass is often expressed in the non-SI unit dalton – equivalently, unified atomic mass unit. 1 Da is defined as 1⁄12 of the mass of a free carbon-12 atom at rest in its ground state.
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