For Atomic Weight we have terms and definitions in 3 topics. The topics are Chemistry, Microbiology and Physical Geography.

The weight in grams of one mole of the chemical element; approximately the number of protons and neutrons in the nucleus.
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The average weight of an atom of an element, i.e. the total mass of protons and neutrons in an atom.
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Combined weight of an atom's electrons, protons, and neutrons.
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