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The relative abundance and atomic masses are: 30.8% for mass of 64.93u
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The relative abundance and atomic masses are: 30.8% for mass of 64.93u

User Mortysporty
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The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are 69.2% for mass = 62.93 amu, and 30.8% for mass = 64.93 amu.

User Alkathirikhalid
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