Question #e6de5

1 Answer
Oct 25, 2016

In nature, copper appears in many different isotopes. These isotopes appear in many different frequencies and masses.

Explanation:

On the periodic table, 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_63CU and _^65CU_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:

(62.93*0.6917)+(64.93*0.3083)(62.930.6917)+(64.930.3083)

43.5287+20.071943.5287+20.0719

63.54663.546 amu