ch. 1 7th Science

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