6.6 - Colours and states of the halogens
Learn the colours and physical states of chlorine, bromine and iodine at room temperature, and distinguish the elements from their vapours and ions.
Colours and states at room temperature
The halogens are the Group 7 elements. These three have different appearances at room temperature (about 20 °C):
| Element | Colour | Physical state |
|---|---|---|
| Chlorine | Pale green / yellow-green | Gas |
| Bromine | Red-brown | Liquid |
| Iodine | Grey / grey-black | Solid |
Keep each colour and state together: green gas, red-brown liquid, grey solid. Chlorine's colour may be described as greenish-yellow; iodine's solid may be described as dark grey or black. These are descriptions of the same substances, not different elements.
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