Question 103
The table shows some information about four elements. These elements are from the same group in the Periodic Table. They are given in the same order as in the Periodic Table.
| Element | Melting point in °C | Boiling point in °C | Reaction with water |
|---|---:|---:|---|
| lithium | 180 | 1342 | Gives off bubbles of gas and gives off heat |
| sodium | | 883 | |
| potassium | 63 | | Gives off gas and gives off so much heat that it catches fire |
| rubidium | 39 | 688 | Explodes with such force that the container cracks. |
There is a trend in the melting points and boiling points of these elements. Use the trend to predict the melting point of sodium.
| Element | Melting point in °C | Boiling point in °C | Reaction with water |
|---|---:|---:|---|
| lithium | 180 | 1342 | Gives off bubbles of gas and gives off heat |
| sodium | | 883 | |
| potassium | 63 | | Gives off gas and gives off so much heat that it catches fire |
| rubidium | 39 | 688 | Explodes with such force that the container cracks. |
There is a trend in the melting points and boiling points of these elements. Use the trend to predict the melting point of sodium.
