Across
- 3. building block of matter
- 4. outer electron shell
- 7. type of reaction; acid + base
- 9. substances that release ions in water
- 11. first & smallest element
- 13. atomic ____ is protons + neutrons
- 14. unequal sharing of electrons
- 16. pH of 7
- 17. bond of shared electrons
- 18. release hydrogen ions in water
Down
- 1. high pH; basic
- 2. element variation due to neutrons
- 5. subatomic, no charge
- 6. charged atom
- 8. bond held by opposite charges
- 9. subatomic, not in nucleus
- 10. atoms joined together
- 12. subatomic, positive
- 15. starting substance of chemical reaction, left side