Across
- 3. atom characterized by the number of protons
- 4. conversion of one chemical element
- 7. high speed electron
- 8. Series of chemical reactions
- 12. positively charged particle
- 13. nuclei combine
- 14. property of some unstable atoms
- 15. radioactive decay
Down
- 1. a reaction that involves change in atom
- 2. nucleus split into smaller nuclei
- 5. disintegration of radioactive substance
- 6. nuclear species of the same chemical element
- 9. basic building block of chemistry
- 10. electromagnetic radiation
- 11. Reduce to half of its initial value