AQA A-Level Chemistry (new spec) 2.3 Group 7 - The Halogens
Study online at https://quizlet.com/_246ikd
1. What are the 5 Fluorine, Chlorine, Bromine, Iodine & Astatine
halogens?
2. Why isn't astatine Because it's very radioactive and can't exist for more than a few seconds before
studied? decaying.
3. What oxidation -1, found as X-1 ions (known as halide ions)
state are the G7
elements usually
found in?
4. Appearance of Very pale yellow gas, highly reactive
G7 elements: Flu-
orine
5. Appearance of Pale green gas, poisonous in high concentrations
G7 elements:
Chlorine
6. Appearance of Red liquid, gives off dense brown or orange poisonous fumes
G7 elements:
Bromine
7. Appearance of Shiny grey solid that sublimes to a purple gas
G7 elements: Io-
dine
8. Appearance of Black solid, is radioactive
G7 elements: As-
tatine
9. Trends of G7:
Boiling point as
1/7
, AQA A-Level Chemistry (new spec) 2.3 Group 7 - The Halogens
Study online at https://quizlet.com/_246ikd
you go down the Increases
group -Number of VDW forces increase between molecules as they're larger
-More energy is needed to break the bonds
10. Trends of G7: Decreases
Electronegativity -Atomic radius increases
-Shielding increases
-Less attraction between the outer electrons and the protons in the nucleus
11. Are the halogens Oxidising
oxidising or re- -They can accept electrons and are reduced
ducing agents? F2(g) + 2e- --> 2F-(aq)
Cl2(g) + 2e- --> 2Cl-(aq)
Br2(l) + 2e- --> 2Br-(aq)
I2(aq) + 2e- --> 2I-(aq)
12. Trends of G7: Ox- Decrease
idising power -Atoms become larger
-Shielding increases
-Outer e-'s are less attracted to the nucleus
13. Are halides oxi- Reducing
dising or reduc- -They can lose electrons and can get oxidised
ing agents? 2F-(aq) --> F2(g) + 2e-
2Cl-(aq) --> Cl2(g) + 2e-
2Br-(aq) --> Br2(l) + 2e-
2I-(aq) --> I2(aq) + 2e-
14. Trends of G7: Re- Increase
ducing power -Atoms larger
-Shielding increases
-Electrons aren't attracted to the nucleus as strongly so they're more easily lost
2/7
Study online at https://quizlet.com/_246ikd
1. What are the 5 Fluorine, Chlorine, Bromine, Iodine & Astatine
halogens?
2. Why isn't astatine Because it's very radioactive and can't exist for more than a few seconds before
studied? decaying.
3. What oxidation -1, found as X-1 ions (known as halide ions)
state are the G7
elements usually
found in?
4. Appearance of Very pale yellow gas, highly reactive
G7 elements: Flu-
orine
5. Appearance of Pale green gas, poisonous in high concentrations
G7 elements:
Chlorine
6. Appearance of Red liquid, gives off dense brown or orange poisonous fumes
G7 elements:
Bromine
7. Appearance of Shiny grey solid that sublimes to a purple gas
G7 elements: Io-
dine
8. Appearance of Black solid, is radioactive
G7 elements: As-
tatine
9. Trends of G7:
Boiling point as
1/7
, AQA A-Level Chemistry (new spec) 2.3 Group 7 - The Halogens
Study online at https://quizlet.com/_246ikd
you go down the Increases
group -Number of VDW forces increase between molecules as they're larger
-More energy is needed to break the bonds
10. Trends of G7: Decreases
Electronegativity -Atomic radius increases
-Shielding increases
-Less attraction between the outer electrons and the protons in the nucleus
11. Are the halogens Oxidising
oxidising or re- -They can accept electrons and are reduced
ducing agents? F2(g) + 2e- --> 2F-(aq)
Cl2(g) + 2e- --> 2Cl-(aq)
Br2(l) + 2e- --> 2Br-(aq)
I2(aq) + 2e- --> 2I-(aq)
12. Trends of G7: Ox- Decrease
idising power -Atoms become larger
-Shielding increases
-Outer e-'s are less attracted to the nucleus
13. Are halides oxi- Reducing
dising or reduc- -They can lose electrons and can get oxidised
ing agents? 2F-(aq) --> F2(g) + 2e-
2Cl-(aq) --> Cl2(g) + 2e-
2Br-(aq) --> Br2(l) + 2e-
2I-(aq) --> I2(aq) + 2e-
14. Trends of G7: Re- Increase
ducing power -Atoms larger
-Shielding increases
-Electrons aren't attracted to the nucleus as strongly so they're more easily lost
2/7
