Across
- 5. group 2
- 7. large and heavy (1 AMU), no electrical charge, located in the nucleus of an atom
- 9. large and heavy (1 AMU), positive charge, located in the nucleus of the atom
- 10. group 7
Down
- 1. group 1
- 2. very light particles (1/2000 AMU), negative electrical charge, move around outside of the nucleus
- 3. group 4
- 4. group 6
- 6. group 5
- 8. group 3