Across
- 2. small particle that is the building blocks of matter
- 6. positively charged particle in the nucleus
- 11. two or more atoms that are held together by chemical bonds and act as a unit
- 12. matter that can vary in composition
- 14. uncharged particle in the nucleus of an atom
- 15. negatively charged particle outside the nucleus
- 16. charged atom
- 17. region in the center of an atom
Down
- 1. matter with a composition that is always the same
- 3. anything that has mass and takes up space
- 4. substances are not evenly mixed
- 5. substance made of only one kind of atom
- 7. atoms having the same number f protons but different number of neutrons
- 8. mixture in which two or more substances are evenly mixed but not bonded
- 9. two or more elements joined
- 10. cloud region around atom's nucleus where electrons are found
- 13. number protons in the nucleus of an atom