Halogens

Exploring non-metals in the periodic table

The Halogens

Properties of Halogens

• Group 7 contains fluorine, chlorine, bromine, iodine and astatine.

• Bromine is liquid at room temperature.

• Bromine and chlorine are harmful if breathed in.

• Iodine is unusual because when it is heated, the solid turns to a purple vapour without becoming a liquid.

Multiple Select

What elements listed below are halogens?

• Bromine

• Carbon

• Nitrogen

• Iodine

Multiple Choice

What halogen is liquid at room temperature?

• Bromine

• Iodine

• Fluorine

• Chlorine

Multiple Select

What halogens are harmful if you breathe them in?

• Bromine

• Chlorine

• Iodine

• Fluorine

Multiple Choice

What halogen becomes a purple vapour when heated without becoming a liquid?

• Bromine

• Chlorine

• Iodine

• Astatine

Patterns in group 7

- The reactivity of the halogens decreases as you go down the group.

-Fluorine is the most reactive, and astatine is the least reactive.

-Fluorine is so reactive that it can't be used in schools.

-Melting points and boiling points increase as you go down group 7.

-Fluorine melts and evaporates at very low temperatures, and astatine melts and evaporates at high temperatures.

Multiple Choice

What is more reactive?

• Iodine

• Fluorine

Multiple Choice

What is more reactive?

• Bromine

• Astatine

Multiple Choice

Which halogen evaporates at a lower temperature?

• Fluorine

• Bromine

Multiple Choice

Which halogen melts at a higher temperature?

• Astatine

• Iodine