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Nitrate
NO₃⁻
Nitrite
NO₂⁻
Carbonate
CO₃²⁻
Sulfate
SO₄²⁻
Sulfite
SO₃²⁻
Phosphate
PO₄³⁻
Permanganate
MnO₄⁻
Perchlorate
ClO₄⁻
Chlorate
ClO₃⁻
Chlorite
ClO₂⁻
Hypochlorite
ClO⁻
Ammonium
NH₄⁺
Hydroxide
OH⁻
Cyanide
CN⁻
Naming pattern for oxyanions
-ate has one more O than -ite (same charge); per- = one more O than -ate; hypo- = one fewer O than -ite
Common salt formulas (A = cation, B = anion)
AB, AB₂, A₂B, AB₃, A₃B, A₂B₃, A₃B₂ (AB₄ is NOT one)
Lattice energy ranking
Compare charges first (higher charge = stronger), then size (smaller ions = stronger)