9
F
fluorine
18.998

General properties

Group
group 17 (halogens)
Period
period 2
Category
halogens
Standard atomic weight
18.998 403 163(6)
Melting point
(F₂) 53.48 K (-219.67 °C)
Boiling point
(F₂) 85.03 K (-188.12 °C)
Phase at STP
gas

Additional properties

Block
p-block
Electron configuration
[He] 2s² 2p⁵
Electrons per shell
2, 7
Electronegativity
3.98
Density
1.696 g/L
Oxidation states
−1 (oxidizes oxygen)
CAS Number
7782-41-4