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The table below shows the properties of some elements.
| Element | Melting point (°C) | Boiling point (°C) |
| Oxygen | -218 | -183 |
| Nitrogen | -210 | -195 |
| Calcium | 842 | 1484 |
| Aluminum | 660.3 | 2519 |
What can you conclude from the information above?
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- Metals and non-metals are solids at room temperature.
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- Semi-metals have low melting and boiling points.
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- The melting and boiling points of non-metals are lower than metals.
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- The melting and boiling points of metals are higher than semi-metals.