Argon
Symbol
Ar
Atomic Number
18
Atomic Weight
39.948
Element Classification
Discovered By
Sir William Ramsey, Baron Rayleigh
Discovery Date
1894 (Scotland)
Name Origin
Greek: argos (inactive).
Density(g/cc)
1.40 (@ -186°C)
Melting Point
83.8
Boiling Point(K)
87.3
Appearance
Colorless, tasteless, odorless noble gas
Atomic Radius(pm)
2-
Atomic Volume(cc/mol)
24.2
Covalent Radius(pm)
98
Ionic Radius
n/a
Specific Heat
0.138
Fusion Heat
n/a
Evaporation Heat(kj/mol)
6.52
Thermal Conductivity(@25°C W/m K)
0.0177
Debye Temperature
85.00
Pauling Negativity Number
0.0
First Ionizing Energy(kj/mol)
1519.6
Oxidation States
n/a
Electronic Configuration
[Ne] 3s2 3p6
Lattice Structure
Face-Centered Cubic(FCC)
Lattice Constant
5.260
Lattice C/A Ratio
n/a
