Chemistry crossword!

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Across
  1. 3. a chart that organizes all of the known elements
  2. 5. the study of matter
  3. 8. a process where one or more substances form new substances
  4. 11. the substance that undergoes a chemical change
  5. 12. the center of an atom
  6. 13. a positively charged sub atomic particle that defines the atomic number
  7. 14. a pure substance made of a specific type of atom
  8. 15. a subatomic particle with no charge.
Down
  1. 1. a negatively charged sub atomic particle that orbits the nucleus
  2. 2. atoms of the same element with different amounts of neutrons
  3. 3. a process that changes a substance's physical properties without changing the chemical composition
  4. 4. two or more atoms that are chemically bonded
  5. 6. a charged atom
  6. 7. the new substance resulting from a chemical change
  7. 9. the smallest building block of matter
  8. 10. two or more different atoms that are chemically bonded