Across
- 5. neutral subatomic particle
- 6. horizontal row on the periodic table
- 7. positive ion
- 9. an example is steam
- 11. negative subatomic particle
- 13. smallest unit of matter
- 17. more electrons than protons
- 18. measure of the amount of matter
- 20. an example is ice
Down
- 1. positive subatomic particle
- 2. an example is water
- 3. charged atom
- 4. dull and easy to break
- 6. more protons than electrons
- 8. the mineral found in our bones and eggshells
- 10. vertical column on the periodic table
- 12. outermost
- 14. the gas we breathe
- 15. shiny and conducts heat and electricity
- 16. mass divided by volume
- 19. negative ion