1. The atomic number of an element tells you

2. Uranium-238 decays into Thorium-234 by emitting

3. What is an atom mostly made up of?

4. Up to how many electrons are on the shells after the first shell?

5. What part of the atom has no charge?

6. In a correctly written symbol what would be located in the "Z" position?

7. How many neutrons does iron have?

8. What orbits the nucleus?

9. What part of the atom has a mass of nearly 0?

10. Name the scientist who carried out the "gold foil experiment".