Across
- 2. causes decay
- 3. occurs in stars
- 5. the number of protons
- 7. the most dangerous radiation
- 9. where the protons and neutrons are
- 10. the time it takes for half of an element to decay
- 12. can be stopped by aluminum
Down
- 1. used to identify elements
- 3. used in nuclear reactors
- 4. protons plus neutrons
- 5. least dangerous radiation
- 6. one reaction starts more
- 8. partials in the nucleus with a neutral charge
- 11. an element with a different number of neutrons