Across
- 4. matter with same composition throughout
- 8. dull in appearance/poor conductor of electricity
- 14. shiny and good conductor of electricity
- 15. atoms of same element w/ different # of neutrons
- 16. Li
- 19. particle with no charge
Down
- 1. Be
- 2. H
- 3. central part of an atom
- 5. atoms of more than one element bonded together
- 6. matter made of only one kind of atom
- 7. positively charged particle
- 9. number of protons + number of neutrons
- 10. He
- 11. B
- 12. top number of an element
- 13. negatively charged particle
- 17. anything that has mass and takes up space
- 18. small particles that makes up most kinds of matter