Across
- 3. positively charged particle
- 6. negatively charged particle
- 9. substances that are blended but not chemically bonded
- 12. matter that is always the same
- 13. atoms held together by chemical bonds
- 14. region surrounding an atom's nucleus
- 16. region at the center of an atom
- 17. atom that has a charge because it has gained or lost electrons
Down
- 1. a mixture with substances that are evenly mixed
- 2. the number of protons in an element
- 4. building block of matter
- 5. two or more elements that are chemically joined
- 7. substance made up of only one kind of atom
- 8. a mixture with substances that are not evenly mixed
- 10. anything that has mass and takes up space
- 11. having the same number of protons, but different neutrons
- 15. an uncharged particle