Atomic Structure and Radioactivity Weekly Quiz

I was well prepared for this quiz. This quiz was over the atomic structure. I understood how to find mass when number of protons and neutrons are given. I also knew who discovered what about the atom. Dalton discovered that the atom was like a solid ball. J.J Thompson discovered that there are electrons in the atom. Rutherford discovered that there is a nucleus in the center of an atom. I also learned how to find the average atomic mass of a substance.
Atomic structure
History
Structure of Atom


http://www.scienceclarified.com/As-Bi/Atomic-Theory.html