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mass of an atom, taken on a scale where the mass of a carbon atom is 12u. in elements that consist of different isotopes the mid-range mass of the isotope mix is given.
atomo baten masa, karbonoaren atomoaren masa 12u duen eskala batean hartuta. isotopo ezberdinez osatutako elementuetan, isotopo nahasketaren barruti ertaineko masa ematen da.
