In this lesson we learned about isotopes, atomic mass and how to calculate the average atomic mass of an isotope. An isotope has the same amount of protons but a different amount of neutrons. most elements on the periodic table have multiple isotopes which is why the atomic mass on the periodic table is a weighted average. The formula we used in order to calculate the percent abundance of an isotope was the mass times the percent amount plus the mass of the other isotope to times the percent abundance of this isotope which gives you the average atomic mass.
if you want to learn more about protons, neutrons, mass, and isotopes visit these websites
http://education.jlab.org/qa/pen_number.html
https://en.wikipedia.org/wiki/Isotope
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