Across
- 2. the number used to organized elements on a periodic table
- 3. when two radioactive nuclei combine and result in energy
- 5. the amount of time it takes for half of the original element to decay
- 9. a neutron splits the nucleus of a radioactive atom
- 10. helium nucleus
- 13. an electron that is sent out of the nucleus
- 14. the average mass taken out of all possible isotopes of an atom
Down
- 1. energy that leaves the nucleus
- 4. when radiation is continuously being emitted
- 6. a particle with a neutral charge
- 7. a positively charged particle of an atom
- 8. the center of an atom
- 11. when two atoms have the same proton number but they differ in mass
- 12. when one action leads to another