Science unit b cross words

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Across
  1. 2. neutral subatomic particle
  2. 4. anything that has mass and occupies space
  3. 6. change where two substances that react and create new substances
  4. 8. the center of the atom
  5. 11. positive subatomic particle
  6. 12. change in appearance and or states
  7. 15. number of protons in a nucleus
  8. 16. the smallest form of matter that is unbreakable
  9. 17. negative subatomic particle
Down
  1. 1. characteristics that can be used to describe a substance
  2. 3. measure of atomic mass
  3. 5. categories where element belong to
  4. 7. material that can't be broken down into any simpler substance
  5. 9. matter that has only one element
  6. 10. vertical row in the periodic table
  7. 12. a table that organizes the elements based on there properties
  8. 13. matter that has two or more elements
  9. 14. horizontal row in the periodic table