Cannot find element for atomic mass. I understand how to find an atomic mass but I cannot find the element for the following:
isotope, Mass, Percent abundance
16x, 15.995, 99.762%
17x, 16.999, 0.038%
18x, 17.999, 0.20%
This problem is from my school text book. I don't have a problem with other examples on the internet or examples in the text book, but the text book problems don't lead to valid elements (so it seems). What am I doing wrong? Thank you.