Across
- 1. has a half-life of 5730 years
- 2. Type of radiation with no electrical charge.
- 6. Mass of a nucleon divided by the number of nucleons.
- 8. the rate of decay of a radioactive isotope.
- 9. Type of radiation with a positive electrical charge.
Down
- 1. ____ are of two types: high-energy particles and gamma rays.
- 3. Person who discovered that mass is congealed energy.
- 4. A mass large enough to sustain fission.
- 5. Any nuclear transformation that moves nucleon towards iron and releases energy.
- 7. Type of radiation with a negative electrical charge.