Chemistry 0620 · IGCSE · Ions and ionic bonds

Ions and ionic bonds — practice question

Some ions have their formulae shown. In which row is the formula incorrect?

  • Aaluminium oxide, $\text{Al}_2\text{O}_3$
  • Biron(II) nitride, $\text{Fe}_2\text{N}_3$
  • Csodium sulfate, $\text{Na}_2\text{SO}_4$
  • Dzinc nitrate, $\text{Zn(NO}_3)_2$

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