Chemistry of Matter

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Across
  1. 2. The number of GROUPS in the Periodic Table
  2. 3. The smallest most basic unit of matter
  3. 6. A change in matter that can be un-done
  4. 8. A change in matter that cant be un-done
  5. 9. Atoms are different from one another because of the number of these
Down
  1. 1. Most elements in the Periodic Table are solids and these
  2. 4. Anything that has mass and volume
  3. 5. The number of protons is equal to the number of these
  4. 7. A group of atoms bonded together