3.1.3- The Halogens Flashcards
How do halogens exist?
As diatomic molecules
What is the trend of atomic radius down the group?
Increases down the group due to shielding
What is the trend of electronegativity as you go down the group?
Electronegativity decreases down the group as atomic radius and shielding increases
What is the trend of mp + bp as you go down the group?
Increases as the mr increases so the strength of the london forces increase
What is the trend in reactivity as you go down the group?
Decreases as atomic radius increases so harder to attract an electron
What is the appearance of fluorine?
Yellow gas
What is the appearance of chlorine?
Green gas
What is the appearance of bromime?
Red/brown liquid
What is the appearance of iodine?
Grey solid that sublimes to a purple vapour
Why are halogens good oxidising agents?
They accept electrons from the species being oxidised
What is the trend in oxidising power as you go down the group?
Decreases down the group due to increased shielding and atomic radius
Why are halide ions good reducing agents?
They donate electrons to the species being reduced
What is the trend of reducing power of halide ions as you go down the group?
Increases down the group as electrons are easier to lose
What is a disproportionation reaction?
Where a species is both oxidised and reduced in a reaction
How does chlorine react with water?
Cl2 + H2O -> ClO- + Cl- + 2H+
