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In nature, copper appears in many different . These isotopes appear in many different frequencies and masses.
On , the value given for copper represents the weighted average of all the masses of all the isotopes of copper. In this instance, there are 2 isotopes of copper: ##_^63CU## and ##_^65CU##. ^63CU appeares in nature at a frequency of 69.17%, and ^65CU appears at frequency of 30.83%. To find the mass given on the periodic table, you do this: (mass of an isotope * percentage in decimal form) + (mass of an isotope * percentage in decimal form), adding any more you need. In this instance, it should look like this:
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