Today I took a unit test in chemistry, it was over atomic structure and radioactivity. I felt that most of the test was fairly easy, but I was a little stumped on the few questions regarding positrons. I guess that I had not studied them well enough, or I might have just gone brain dead, but I completely forgot what they were, so when I got home I looked them up online and found a few helpful sites.
Britannica, Chemteam, stlcc.
I also found it hard to remember how to find the percent abundance of the lighter of 2 masses given. I rem ember learning the formula in class, but I could not recall it during the test. Luckily I understood the concept well enough that I was able to determine the answer without using the formula. Since it gave the total mass of each isotope and the average atomic mass, I was able to determine depending on where the average lay between the 2 total masses, about what the percentage was, and since it was multiple choice, I was able to plug in my 2 guesses to find out which one matched the average.
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