Periodic Table and common formulae

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Across
  1. 2. Acid HNO3
  2. 4. Ca
  3. 7. Acid HCl
  4. 8. Subatomic particle with no charge
  5. 10. Cu
  6. 12. Atom that has gained or lost electrons
  7. 14. CO3
  8. 15. Negatively charged subatomic particle
  9. 17. Atom that has no charge
  10. 18. C
  11. 19. SO4
  12. 20. Na
  13. 21. O
Down
  1. 1. K
  2. 3. Cl
  3. 5. OH
  4. 6. Acid H2SO4
  5. 9. H
  6. 11. Mg
  7. 13. Center of the atom
  8. 16. Positively charged subatomic particle