Fluorine = yellow gas
Chlorine = pale green gas
- yellow/green in hexane
- chlorine water is pale yellow
Bromine = red-brown liquid
- orange-brown in hexane
Iodine = grey solid
- purple in hexane
Astatine = black solid
Properties:
- all form acidic hydrides
- electronegativity decreases as you go down the group
- they all exist as diatomic molecules
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