The factor in determining the average atomic mass of an element is:
B or 2 relative abundance of each isotope because the by looking at how many protons , electrons and neutrons the most isotope is of the element has relative abundance.
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I think it's 2:1 or 2:1:4. I mostly think it's 2:1 though. (:
4d7 , 3s2 will be the valence shell electronic configuration of a neutral atom of cobalt!
