Atomic weight (English: Atomic mass) is the mass of an atom or isotopes, one of the elements to any unit is a unit atomic mass or am Yu (Atomic. Mass Unit - AMU) by 1 am Yu was 1.66 x 10-24 G by weight than from hydrogen atoms 1 atoms, or 1 / 12 of carbon - 12 1 atoms, or 1 / 16 of oxygen atom, atomic 1
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