A science museum displays samples of three halogens in sealed glass tubes.
The table shows some information about these halogens at room temperature.
| Halogen | Colour | State at room temperature |
|---|---|---|
| chlorine | yellow-green | gas |
| bromine | red-brown | ? |
| iodine | ? | solid |
Give the number of the group in the periodic table that contains the halogens.
State the physical state of bromine at room temperature.
Give the colour of solid iodine.
The halogens exist as molecules made of two atoms. Give the formula of a molecule of chlorine.
Describe the trend in the colour of the halogens going down the group.
Astatine is the halogen below iodine in the group. Predict the physical state of astatine at room temperature. Give a reason for your answer.
41 exam-style questions on Edexcel GCSE Chemistry 7.2 Group 7, covering 7.2.1 Physical properties of the halogens, 7.2.2 Reactions of the halogens, 7.2.3 Relative reactivity and displacement reactions of the halogens, and 7.2.4 Halogen displacement as a redox reaction. Each one has a worked solution and a mark scheme showing where the marks go.