18
Ar
argon
39.95

General properties

Group
group 18 (noble gases)
Period
period 3
Category
noble gases
Standard atomic weight
39.95
[39.792, 39.963]
Melting point
83.81 K (-189.34 °C)
Boiling point
87.302 K (-185.848 °C)
Phase at STP
gas

Additional properties

Block
p-block
Electron configuration
[Ne] 3s² 3p⁶
Electrons per shell
2, 8, 8
Electronegativity
–
Density
1.784 g/L
Oxidation states
0
CAS Number
7440-37-1