Group VII: The Halogens

Identify the non-metal which is a black solid that forms a purple vapour when you heat it gently.

Identify the non-metal that is a yellow gas which is so reactive and is not allowed in school labs.

Identify the non-metal which is a green poisonous gas.

Identify the non-metal which is colourless which is used in balloons and airships.

The fifth element in Group $\mathrm{Vll}$ is called astatine. It is a very rare element. Do you expect it to be harmful or harmless?

The fifth element in Group $\mathrm{Vll}$ is called astatine. It is a very rare element. Do you expect it to be coloured or colourless?

The fifth element in Group $\mathrm{Vll}$ is called astatine. It is a very rare element. Do you expect it to be a gas, a liquid, or a solid? Give your reason.

Explain why the following reaction occurs.

${\mathrm{Br}}_2 + 2\mathrm{KI} \to 2\mathrm{KBr} + {\mathrm{I}}_2$

Write a word equation for the reaction of bromine with potassium iodide. What do you expect to see? 

What makes the halogens so reactive? 

Which type of bonding do halogens have?

Describe any similarities you notice in the products that form when the halogens react with iron wool. 

Explain whether the trend of reactivity of Group $\mathrm{VII}$ is the same as that of Group $\mathrm{I}$.

Describe the trend in reactivity in Group $\mathrm{VII}$.

What do the halogens look like? Describe them.