I just switched to a Macbook Air, and I love it (never going back). However, I need help in numbers for a class project. Numbers is somewhat different from excel, even though I have no idea what I'm doing with either.... what I need to do is figure out a way to input the periodic table with all the elements listed with their atomic mass. I would like to be able to do is (on a separate sheet), be able to type in an element, and have it return its atomic mass. Also, if i type in more than one element, I would like it to give me the sum of both elements' atomic masses. Any information on how to do this would be a life saver! Thanks, Grant.