Atomic stuff I guess

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Across
  1. 2. NaCl
  2. 4. The smallest piece of matter that you can get.
  3. 6. CO
  4. 7. Au
  5. 11. Fe
  6. 12. Atoms chemically bonded together.
  7. 13. Negatively charged particle in an atom.
  8. 15. W
  9. 16. Positively charged particle in an atom.
Down
  1. 1. CO2
  2. 3. A molecule that has one or more atoms that aren't similar to each other, the opposite of an element.
  3. 5. H2O
  4. 8. A molecule that has only has atoms that are similar to each other, the opposite of a compound.
  5. 9. Ti
  6. 10. Neutrally charged particle in an atom.
  7. 14. Y