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atomic mass▼(mass of an atom)noun[UK: ə.ˈtɒ.mɪk mæs] [US: ə.ˈtɑː.mɪk ˈmæs]
atomic mass unit▼(a unit of mass equal to 1/12 the mass of an atom of the 12C isotope of carbon)noun
relative atomic mass▼(ratio)noun
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