Bromine and iodine are halogens.
Complete the table by giving the missing colour of bromine and the physical state of iodine at room temperature.
| Halogen | Colour | Physical state at room temperature |
|---|---|---|
| bromine | liquid | |
| iodine | dark grey |
Phosphorus reacts with bromine to form the covalent compound phosphorus tribromide.
Draw a dot-and-cross diagram to show the outer electrons in a molecule of phosphorus tribromide.
You can use the following layout of atoms as a guide:
BrPBrBr \begin{array}{ccc} \text{Br} & \text{P} & \text{Br} \\ & \text{Br} & \end{array} BrPBrBrPhosphorus tribromide reacts with water to form a mixture of two acids, HBr\text{HBr}HBr and H3PO3\text{H}_3\text{PO}_3H3PO3.
Write a chemical equation for this reaction.
