Question #e6de5

1 Answer
Oct 25, 2016

Answer:

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# 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:

#(62.93*0.6917)+(64.93*0.3083)#

#43.5287+20.0719#

#63.546# amu