Chemistry 0620 · IGCSE · Ions and ionic bonds

Ions and ionic bonds — practice question

The formulae for some ions are given below. In which row is the formula incorrect?

  • Aaluminium sulfate, $\text{Al}_2(\text{SO}_4)_3$
  • Bcalcium nitrate, $\text{Ca}(\text{NO}_3)_2$
  • Ciron(III) bromide, $\text{Fe}_3\text{Br}$
  • Dpotassium sulfide, $\text{K}_2\text{S}$

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