Across
- 2. 2 small nuclei go into one
- 7. least penetrating particle
- 8. most penetrating particle
- 9. 1 nuclei split into two
- 11. number on top of an element
- 12. Atoms with the same number of protons but different numbers of neutrons
- 14. same mass as a proton with no electric charge
Down
- 1. Protons+neutron=
- 3. The thing in the middle of an atom
- 4. Where an element is bad for you it can cause cancer if exposed for to long
- 5. one thing that leads to another and then they all start going off
- 6. how long it takes to decompose into half
- 10. has a positive charge
- 13. 2 most penetrating particle