Across
- 3. each element has this number
- 5. alters the composition of a substance
- 8. do not alter the basic nature of a substance
- 10. the heavier isotopes
- 11. one or two letter chemical shorthand
- 12. inactive and stored
- 13. stored in bonds of chemical substances
- 15. does not take up space
- 17. smallest particle ever
- 18. The more modern model of atomic structure
- 20. process of spontaneous atomic decay
- 21. from the movement of charged particles
Down
- 1. doing work
- 2. have a positive charge
- 4. directly involved in moving matter
- 6. same number of protons and electrons
- 7. energy that travels in waves
- 9. The table of elements
- 14. are uncharged and neutral
- 16. the sum of protons and neurons
- 19. have a negative charge