Atomic Stucture and radioactivity post 4

I passed my pre-lab quiz today which I was extremly nervous about, and after a day in lab I understand the way the formula works and how to work out these types of problems! I also now know was an isotope is for the first time ever and ive never really known. I enjoyed this lab and had lots of fun with the calculations, i am anxious to see what else this unit has instore. I am rather nervous for the quiz tomorrow not for the math but for knowing the different theories. I am studying tonight.