C1: GROUP 7

Question 1

Proprties of group 7 elements

Answer 1

-non-metals with coloured vapours
-as you go down the group the elements become less reactive
-as you go down the group boiling and melting point increases

Question 2

How do halogens react with other non metals and how do they react with metals?

Answer 2

-non-metals: form molecular compounds
-metals: form ionic bonds

Question 3

Displacement reactions with halogens

Answer 3

a more reactive halogen can displace a less reactive halogen
(eg: chlorine + potassium iodide → potassium choride + iodine)

Question 4

Describe the trend in reactivity in group 7 elements

Answer 4

-as you go down the group the atoms get larger
-this means that the outermost electron is further away from the nucleus
-therefore the forces of attraction between the nucleus and the outermost electron are weaker
-therefore it is difficult to gain an electron which makes the element less reactive