Periodic Table and common formulae

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