Table 1 shows the melting points and boiling points of four Period 3 elements.
Table 1
| Element | Melting point (°C) | Boiling point (°C) |
|---|---|---|
| Argon | -189 | -186 |
| Chlorine | -101 | -34 |
| Phosphorus | 44 | 280 |
| Sodium | 98 | 883 |
State which two elements from Table 1 are solids at room temperature (20 °C).
