1. Polyatomic Ions
= Group of atoms that behaves like a unit, and has a charge.
CO32-
charge -2
1 atom
3 atoms

2. Polyatomic Ions
Keep a record of how many good ones you do!

3. CO32-
carbonate

4. NH4+
ammonium

5. SO42-
sulfate

6. SO32-
sulfite

7. PO43-
phosphate

8. PO33-
phosphite

9. NO3-
nitrate

10. NO2-
nitrite

11. ClO3-
chlorate

12. ClO2-
chlorite

13. ClO4-
perchlorate

14. ClO3-
chlorate

15. ClO2-
chlorite

16. ClO-
hypochlorite

17. ClO4- perchlorate ClO3- chlorate ClO2- chlorite ClO- hypochlorite
Summarizing the chlorates:
ClO4-
perchlorate
ClO3-
chlorate
ClO2-
chlorite
ClO-
hypochlorite

18. OH-
hydroxide

19. CN-
cyanide

20. CH3COO- or C2H3O2-
acetate

21. HSO4-
Hydrogen sulfate

22. HSO3-
Hydrogen sulfite

23. MnO4-
permanganate

24. Hydrogen carbonate (“bicarbonate”)
HCO3-
Hydrogen carbonate (“bicarbonate”)

25. CrO42-
Chromate

26. C2O42-
oxalate

27. H3O+
hydronium

28. Sn2+
Tin II (stannous)

29. Sn4+
Tin IV (stannic)

30. Fe2+
Iron (II)
ferrous

31. Fe3+
Iron (III)
ferric

32. BrO3-
bromate

33. NH4+
ammonium