group 7

Question 1

trend in reducing ability down the group (4)

Answer 1

-increases
-larger atomic radius
-more shielding
-weaker electrostatic attraction so electron lost more easily

Question 2

trend in oxidising power down the group (4)

Answer 2

decreases
-larger atomic radius
-more shells, more shielding
-weaker attraction between nucleus and extra electron so electrons gained less easily

Question 3

trend in BP down group (4)

Answer 3

-increases
-larger molecule
-stronger VDW between molecules
-more polarisable

Question 4

trend in electronegativity down group(4)

Answer 4

-decreases
-atomic radius increases
-more shells, more shielding
-bonding pair harder to attract

Question 5

appearances of the 4 halogens

Answer 5

fluorine= yellow gas
chlorine= green gas
bromine= brown liquid
iodine= black solid