Cambridge Secondary (7-9). Stage 7. MCE Science. Workbook - Unit 7: Properties of Materials - Question 36

The properties of two elements, R and Q, are compared below:

| Property | R | Q |
|---|---|---|
| Melting point | 1083°C | 98°C |
| Boiling point | 2567°C | 883°C |
| Reactivity | unreactive | reacts with water |
| Thermal conductivity | good | good |
| Electrical conductivity | excellent | good |

Are these two elements metals or non-metals? Explain your answer.