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 (K)
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 (kJ/mol)
n/a
Evaporation Heat (kJ/mol)
6.52
Thermal Conductivity (@25°C W/m K)
0.0177
Debye Temperature (K)
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
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