Paper 1 - The Halogens Flashcards
What is the colour of Chlorine at room temperature
Green
What is the colour of Bromine at room temperature?
red-brown
What is the colour of Iodine at room temperature?
Dark grey
What is the physical state of Chlorine at room temperature?
Gas
What is the physical state of Bromine at room temperature?
Liquid
What is the physical state of Iodine at room temperature?
Crystalline solid
What are some characteristics of Chlorine?
- Fairly reactive
- Poisonous
What are some characteristics of Bromine?
- Poisonous
- Gives off an orange vapour
What are some characteristics of Iodine?
Gives off a purple vapour when heated
Use your knowledge of trends in Group 7 to predict the properties of other halogens
As the atomic number of the halogens increases, the elements have a darker colour and a higher boiling point
How do displacement reactions involving halogens and halides provide evidence for the trend in reactivity in Group 7?
- Halogen atoms have 7 electrons in their outer shell. They can gain one electron to form a -1 ion
- The easier it is for a halogen to attract an electron, the more reactive the halogen will be.
- The further down group 7, the less reactive the halogens are as it gets harder to attract the extra electron to fill the outer shell since its atomic radius is larger
Explain the trend in reactivity in Group 7 in terms of electronic
configurations
- Halogen atoms have 7 electrons in their outer shell. They can gain one electron to form a -1 ion
- The easier it is for a halogen to attract an electron, the more reactive the halogen will be.
- The further down group 7, the less reactive the halogens are as it gets harder to attract the extra electron to fill the outer shell since its atomic radius is larger
