define atomic weight
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Explanation:
The atomic mass is the mass of an atom. Although the SI unit of mass is kilogram, the atomic mass is often expressed in the non-SI unit dalton where 1 dalton is defined as ¹⁄₁₂ of the mass of a single carbon-12 atom, at rest.
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Answer:
Number of protons + neutrons
It is the weight of one atom of an element multiplied by 1/12th of the weight of C¹² atom.
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