physical properties Flashcards
1
Q
what do halogens exist as?
A
diatomic molecules
2
Q
state the appearances of F, Cl, Br and I at room temp
A
F = pale yellow gas
Cl = pale green gas
Br = brown liquid
I = grey solid which sublimes to purple vapor
3
Q
describe the trend in boiling point down the group
A
- increases
- atomic radius and relative mass increase
- so london forces are stronger so more energy required
4
Q
describe the trend in electronegativity down the group
A
- decreases
- atomic radius and shielding increase
- so nuclear attraction decreases and electrons are less easily gained
5
Q
describe the trend in reactivity down the group
A
- decreases
- atomic radius increases
- nuclear attraction decreases
- electrons less easily attracted
6
Q
what does the reactivity trend of halogens mean in terms of displacement?
A
- more reactive halogens displace less reactive halides
- halogens are less easily oxidised down the group so they displace halides LOWER DOWN