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|
Argon
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Ar | 18 | 39.948 | -189.35 °C | -185.85 °C | Gas | 1.784 g/L | Noble Gas |
|
|
|
| General |
| Name, symbol, number |
argon, Ar, 18 |
| Chemical series |
noble gases |
| Group, period, block |
18, 3, p |
| Appearance |
colorless
 |
| Standard atomic weight |
39.948(1) g·mol−1 |
| Electron configuration |
[Ne] 3s2 3p6 |
| Electrons per shell |
2, 8, 8 |
| Physical properties |
| Phase |
gas (At room temperature) |
| Density |
(0 °C, 101.325 kPa)
1.784 g/L |
| Melting point |
83.80 K
(−189.35 °C, −308.83 °F) |
| Boiling point |
87.30 K
(−185.85 °C, −302.53 °F) |
| Triple point |
83.8058 K, 69 kPa |
| Critical point |
150.87 K, 4.898 MPa |
| Heat of fusion |
1.18 kJ·mol−1 |
| Heat of vaporization |
6.43 kJ·mol−1 |
| Heat capacity |
(25 °C) 20.786 J·mol−1·K−1 |
|
|
| Atomic properties |
| Crystal structure |
cubic face centered |
| Oxidation states |
0 |
| Electronegativity |
no data (Pauling scale) |
Ionization energies
(more) |
1st: 1520.6 kJ·mol−1 |
| 2nd: 2665.8 kJ·mol−1 |
| 3rd: 3931 kJ·mol−1 |
| Atomic radius |
71 pm |
| Atomic radius (calc.) |
71 pm |
| Covalent radius |
97 pm |
| Van der Waals radius |
188 pm |
| Miscellaneous |
| Magnetic ordering |
nonmagnetic |
| Thermal conductivity |
(300 K) 17.72 m W·m−1·K−1 |
| Speed of sound |
(gas, 27 °C) 323 m/s |
| CAS registry number |
7440–37–1 |
| Selected isotopes |
|
|
| References |
|
Argon Compounds
|
Source: Wikipedia article Argon
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Chemistry Quick Facts
