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Group 17 element
Halogens
chalcogens
←
→
noble gases
IUPAC group number
17
Name by element
fluorine group
Trivial name
halogens
CAS group number
(US, pattern A-B-A)
VIIA
old IUPAC number
(Europe, pattern A-B)
VIIB
↓
Period
2
Fluorine
(F)
9
Halogen
3
Chlorine
(Cl)
17
Halogen
4
Bromine
(Br)
35
Halogen
5
Iodine
(I)
53
Halogen
6
Astatine
(At)
85
Halogen
Legend
primordial element
element from decay
Atomic number color:
black=solid
,
green=liquid
,
red=gas
...
Wikipedia
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