group 7 Flashcards
1
Q
what are elements in group 7 known as
A
Halogens
2
Q
how do halogens exist
A
the exist is diatomic molecules that are covalently bonded
3
Q
What is the pattern as you go down group 7
A
Boiling points increase
4
Q
describe how chlorine is at room temperature
A
it’s a yellow green gas
5
Q
what do bromine look like at room temperature
A
a poisonous red brown liquids which gives off an orange vapour
6
Q
what does iodine look like in room temperature
A
a dock grey solid which gives off purple vapor when heated
7
Q
what is the test for chlorine
A
chlorine bleaches damp blue litmus paper turning it white (if it’s an acid it will turn red first)
8
Q
why does reactivity decrease going down group 7
A
- only needs one electron so have a stable electronic structure
- as you go down the road it gets harder to track the electron because the shows are further away from the nucleus
9
Q
who is the order of halogen reactivity
A
- Fluorine
- Chlorine
- Bromine
- Iodine
10
Q
what do halogens react with metals to form
A
metal halides
