A model of each of two unfamiliar substances gives the information in the table.
| Substance | Information shown by the model |
|---|---|
| J | The atoms occur in separate groups of four. Shared pairs of electrons join atoms within each group. No shared pairs join one group to another. |
| K | Shared pairs of electrons join each atom to neighbouring atoms. This repeating arrangement continues throughout the sample. |
A student concludes that J and K have the same type of structure because both contain shared pairs of electrons.
Explain why the student's conclusion is incorrect. Refer to the forces that hold the particles together in each substance.
122 exam-style questions on OCR GCSE Chemistry 2.2 Bonding, covering 2.2.1 Metals, non-metals and the Periodic Table, 2.2.2 Types of chemical bonding and dot and cross diagrams, 2.2.3 Limitations of bonding models, and 2.2.4 Reactivity, atomic number and the modern Periodic Table. Each one has a worked solution and a mark scheme showing where the marks go.