Wed October 26, 2011 By:

What is the difference between atomic mass and relative atomic mass?

Expert Reply
Fri October 28, 2011
Each isotope has a different actual atomic mass because of a difference in neutrons. The relative, or average atomic mass is the weighted average of the isotopes. Multiply the mass of each isotope by its fraction and you will get the atomic mass that you see in the periodic table.

The mass number is a whole number and represents the total of protons and neutrons in a given isotope.
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