Across
- 5. negative charge
- 7. Electrons with not a lot of mass and take up most space
- 8. Number of Protons and Neutrons
- 9. Where the protons and neutrons are held
Down
- 1. Electrons on the outer most shell
- 2. element with atomic number 5
- 3. Number of Protons=Number of electrons
- 4. positive charge
- 6. Where there is a complete outer shell
- 10. element with atomic mass 40 that has 2 valance electrons