Across
- 1. chemical symbols with subscripts and coefficients that combines
- 4. Center of an atom
- 7. a single substance that has a defined composition
- 10. Smallest particles of an element
- 11. negatively charged particle
- 15. organization tool for each different type of element
- 17. the location outside the nucleus
- 18. shows the number of molecules involved
- 19. shows the number of atoms involved
Down
- 2. number of protons in an atom
- 3. super small particle
- 5. pure substance made up of only one type of atom
- 6. Anything with volume or mass
- 7. positively charged particle
- 8. made when 2 or more atoms join together
- 9. have no charged particle
- 12. 2 or more elements combine
- 13. and atom that has an equal amount of protons and neutron
- 14. average mass of protons and neutrons
- 16. 1-3 letter abbreviation that represents the type of atom