شابلون:Periodic table (halogens)

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

Image: Liquid fluorine at cryogenic temperatures

Fluorine (F)
9 Halogen

3

Image: Chlorine gas

Chlorine (Cl)
17 Halogen

4

Image: Liquid bromine

Bromine (Br)
35 Halogen

5

Image: Iodine crystal

Iodine (I)
53 Halogen

6

Astatine (At)
85 Halogen

Legend

primordial element

element from decay

Atomic number color:

black=solid, green=liquid, red=gas

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