1. The atomic number of potassium is 19. Therefore, the Potassium atom has:

2. What is at the center of every atom?

3. Which two particles make up the nucleus of an atom?

4. In an atom, what is the number of protons equal to?

5. The positively charged particles of an atom are the ________.

6. The negatively charged particles of an atom are the ______.

7. What is this called?

8. An electron has this charge

9. A neutron has this charge

10. A proton has this charge