Across
- 4. spreading a reaction
- 9. the total mass of a atom
- 10. a particle with a positive charge
- 12. amount of time it takes for a radioactive isotope to decay
- 13. high speed unstable atom that comes from a neutron becoming a proton
- 14. a particle with no charge
Down
- 1. The amount of protons in a atom
- 2. a helium 4/2
- 3. this is used to treat cancer
- 5. atoms are fused together with this
- 6. atoms are split with this
- 7. a atom with more or less neutrons than normal
- 8. caused by the decay of atomic nuclei
- 11. the center of a atom