There are two different types (isotopes) of copper atoms. One type of copper atoms weighs in at 62.93 amu, the other has a mass of 64.94 amu. The lighter isotope is more common making up 69.09% of the naturally occurring copper. The remainder of the atoms, 30.91% have a mass of 64.94 amu.
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There are two different types (isotopes) of copper atoms. One type of copper atoms weighs in at 62.9...
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