Formulae of ionic compounds

Not all ions are made from single atoms

Called molecular ions

Nitrate - NO₃^- . Carbonate - CO₃^2-. Sulfate - SO₄^2-. Hydroxide - OH^-. Ammonium - NH₄⁺. Zinc ion - Zn²⁺. Silver ion - Ag⁺.

Salts are ionic compounds

When acids and bases react, they form water and salt. Salts are ionic compounds. They are a lattice of +ve & -ve ions. In some salts, water molecules are in the lattice, these are called water of crystallisation. Salts containing water are hydrated, whilst the others are anhydrous.

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