Across
- 3. / smallest building block of matter
- 7. / subatomic particle with negative charge
- 8. / a level of electrons surrounding the nucleus
- 9. / electron found on the last orbital
- 10. / total number of protons and neutrons
- 11. / found in the center of an atom, contains neutrons and protons
- 13. / the number of protons in an atom
- 15. / subatomic particle with no charge
Down
- 1. / how much matter in an object
- 2. / contains the electrons in an atom
- 4. / any element bonded with another element
- 5. / states that matter cannoobjectt be created or destroyed
- 6. / subatomic particle with a positive charge
- 12. / mass of an atom
- 14. / at least two different elements bonded together