Understanding polyatomic ions
Today we continued our discussion on molecules and naming ionic compounds. After a review of the octet rules and why molecules form, we named and wrote formulas for various ionic compounds, as well as learned about polyatomic ions. We then finished by learning about covalent bonds and how to draw lewis structures for molecules containing this type of bonding. The students were fantastic in engaging with today’s exploration and clearly have a strong knowledge base they are building as we move to more advanced topics.
Common Polyatomic Ions;
| Polyatomic Ion | Chemical Symbol | Charge |
|---|---|---|
| Dihydrogen phosphate | H₂PO₄⁻ | -1 |
| Acetate | C₂H₃O₂⁻ | -1 |
| Hydrogen sulfite | HSO₃⁻ | -1 |
| Hydrogen sulfate | HSO₄⁻ | -1 |
| Hydrogen carbonate | HCO₃⁻ | -1 |
| Nitrite | NO₂⁻ | -1 |
| Nitrate | NO₃⁻ | -1 |
| Cyanide | CN⁻ | -1 |
| Hydroxide | OH⁻ | -1 |
| Permanganate | MnO₄⁻ | -1 |
| Hypochlorite | CIO₂⁻ | -1 |
| Chlorite | CIO₂⁻ | -1 |
| Chlorate | CIO₃⁻ | -1 |
| Perchlorate | CIO₄⁻ | -1 |
| Hydrogen phosphate | HPO₄²⁻ | -2 |
| Oxalate | C₂O₄²⁻ | -2 |
| Sulfite | SO₃²⁻ | -2 |
| Sulfate | SO₄²⁻ | -2 |
| Carbonate | CO₃²⁻ | -2 |
| Chromate | CrO₄²⁻ | -2 |
| Dichromate | Cr₂O₇²⁻ | -2 |
| Silicate | SiO₃²⁻ | -2 |
| Phosphite | PO₃³⁻ | -3 |
| Phosphate | PO₄³⁻ | -3 |
| Ammonium | NH₄⁺⁻ | +1 |