A complete model of sodium oxide contains only sodium ions, Na+\text{Na}^{+}Na+, and oxide ions, O2−\text{O}^{2-}O2−. The empirical formula of sodium oxide is Na2O\text{Na}_2\text{O}Na2O.
Which pair of ion counts could be present in the complete model?
6 Na+6\ \text{Na}^{+}6 Na+ ions and 12 O2−12\ \text{O}^{2-}12 O2− ions
18 Na+18\ \text{Na}^{+}18 Na+ ions and 6 O2−6\ \text{O}^{2-}6 O2− ions
12 Na+12\ \text{Na}^{+}12 Na+ ions and 12 O2−12\ \text{O}^{2-}12 O2− ions
12 Na+12\ \text{Na}^{+}12 Na+ ions and 6 O2−6\ \text{O}^{2-}6 O2− ions
98 exam-style questions on AQA GCSE Chemistry 2.1 Chemical bonds, ionic, covalent and metallic, covering 2.1.1 Chemical bonds, 2.1.2 Ionic bonding, 2.1.3 Ionic compounds, 2.1.4 Covalent bonding, and 2.1.5 Metallic bonding. Each one has a worked solution and a mark scheme showing where the marks go.