halogens Flashcards
1
Q
formula for fluorine, chlorine, bromine, iodine and astatine
A
F2, Cl2, Br2, I2, At2
2
Q
the following trends in properties of halogens?
A
- All are diatomic
- Colours get darker down the group
- MP/BP increases down the group
- reactivity decreases down the group
2
Q
fluorine colour
A
very pale yellow
3
Q
chlorine colour
A
pale green
4
Q
astatine colour
A
black
5
Q
bromine colour
A
brown
6
Q
iodine colour
A
dark grey
6
Q
what state is bromine
A
liquid
7
Q
what state is fluorine and chlorine
A
gas
8
Q
what is state is iodine and astatine
A
solid
9
Q
other properties of iodine
A
Sublimes, releases purple fumes
10
Q
other properties of bromine
A
Volatile, releases brown fumes
11
Q
what happens when halogens react with metals
A
halogens form ionic compound
12
Q
how many electrons are needed to fill halogen outer shell
A
one
13
Q
why do halogens get less reactive going down the group
A
- Atoms have more electron shells
- The extra electron is further from the nucleus
- So its attraction to the nucleus is weaker
