Chapter 2 - Polyatomic Ions

Here is the updated list of common polyatomic ions, including thiocyanate:

1. Ammonium: NH₄⁺

2. Nitrate: NO₃⁻

3. Nitrite: NO₂⁻

4. Sulfate: SO₄²⁻

5. Sulfite: SO₃²⁻

6. Phosphate: PO₄³⁻

7. Phosphite: PO₃³⁻

8. Carbonate: CO₃²⁻

9. Bicarbonate (Hydrogen Carbonate): HCO₃⁻

10. Acetate: C₂H₃O₂⁻

11. Chlorate: ClO₃⁻

12. Chlorite: ClO₂⁻

13. Hypochlorite: ClO⁻

14. Perchlorate: ClO₄⁻

15. Cyanide: CN⁻

16. Oxalate: C₂O₄²⁻

17. Silicate: SiO₄⁴⁻

18. Arsenate: AsO₄³⁻

19. Arsenite: AsO₃³⁻

20. Borate: BO₃³⁻

21. Thiosulfate: S₂O₃²⁻

22. Chromate: CrO₄²⁻

23. Dichromate: Cr₂O₇²⁻

24. Permanganate: MnO₄⁻

25. Hydroxide: OH⁻

26. Thiocyanate: SCN⁻

Additional hydrogen-containing ions:

• Dihydrogen Phosphate: H₂PO₄⁻

• Hydrogen Phosphate: HPO₄²⁻

• Hydrogen Sulfate (Bisulfate): HSO₄⁻

• Hydrogen Sulfite (Bisulfite): HSO₃⁻