Across
- 4. shows the number of atoms involved
- 7. shows the number of molecules involved
- 9. A pure substance made up of only one type of atom
- 11. 2 or more elements combine
- 14. made when 2 or more atoms join together
- 15. 1-3 letter abbreviation that represents the type of atom
- 16. negativity charged subatomic particle
- 17. subatomic particles located in the nucleus
- 18. A single substance that has a definite composition
- 19. anything with volume or mass
Down
- 1. chemical symbols with subscripts and coefficients combined to represent molecules
- 2. super small particles
- 3. number of protons within an atom
- 5. organization tool for each element
- 6. atom that has an equal number of protons and neutrons
- 8. average mass of protons and neutrons
- 9. the location outside the nucules
- 10. smallest particle or an element
- 12. positively charged particle
- 13. center of the atom