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6. What is the charge for Oxide?
7. What is the charge for SO4?
8. What is the charge for Lithium?
9. What is the charge for Potassium?
10. What is the charge for Ammonium?
11. What is the charge for Iron (II)?
12. What is the charge for Calcium?
13. What is the charge for Strontium?
14. What is the charge for Hydroxide?
15. What is the charge for Sulphur?
16. What is the charge for Copper (I)?
18. What is the charge for Flourine?
19. What is the charge for Copper (II)?
20. What is the charge for Chlorine?