1. How many electrons does iron have?

2. Name the pictured element.

3. What is the number of protons that the element in this image contain?

4. What is the atomic mass of the pictured isotope?

5. What model of an atom is shown in the diagram?

6. Most of the mass in an atom is made up of _____________________?

7. What is fired at the gold foil in this experiment?

8. Different isotopes have different _____________.

9. How many different types of atoms are elements made from?

10. How many neutrons does a Carbon 13 atom have?