Cogitania

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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