Physical Trends in Group 17
- The Group 17 elements are called halogens
- The halogens have uses in water purification as bleaching agents (chlorine), as flame-retardants and fire extinguishers (bromine) and as antiseptic and disinfectant agents (iodine)
Colours
- All halogens have distinct colours which get darker going down the group
The colours and states of the Group 17 elements
The colours of the Group 17 elements get darker going down the group
Volatility
- Volatility refers to how easily a substance can evaporate
- A volatile substance will have a low melting and boiling point
Melting & boiling points of the Group 17 elements
The melting & boiling points of the Group 17 elements increase going down the group which indicates that the elements become less volatile
- Going down the group, the boiling point of the elements increases which means that the volatility of the halogens decreases
- This means that fluorine is the most volatile and iodine the least volatile