Group 7

Question 1

Why does reactivity decrease as the group goes down?

Answer 1

As you go down, there are more shells between the proton and reacting electron
Shielding theory - this lessens the attraction so less reactive with more shells

Question 2

How many electrons do halogens have in outer shell?

Answer 2

7

Question 3

Group 7 molecules

Answer 3

2 of the same element’s atoms react together to form a covalent bond between them

Question 4

Melting and boiling points as you move down the group?

Answer 4

They increase
They require more energy to change state