Group 7 Trends

Question 1

Trend in atomic radius down a group

Answer 1

Increases down the group
Number of occupied energy levels increases
Atom size increases

Question 2

Trend in electronegativity

Answer 2

Decreases down the group
Radius of each atom increases
More shielding so less attraction between + nucleus and outer e-

Question 3

Trend in boiling point of group 7

Answer 3

Increases down the group
Larger molecules
So stronger van der waal forces
More energy needed to overcome

Question 4

Oxidising power of group 7

Answer 4

Decreases down the group
Fewer shells in F so less shielding
Closer e- can get to the nucleus
E- more strongly attracted to nucleus so is more likely to accept e-

Question 5

Reducing ability of group 7

Answer 5

Increases down the group
Number of shells increases so shielding increases
Outer e- are less strongly attracted to the nucleus
The e- are lost more easily and halide ion is more readily oxidised