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|
Hydrogen
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| H | 1 | 1.00794 | -259.14 °C | -252.87 °C | Gas | 0.08988 g/L | Non-Metal |
|
|
|
| General |
| Name, symbol, number |
hydrogen, H, 1 |
| Chemical series |
nonmetals |
| Group, period, block |
1, 1, s |
| Appearance |
colorless
 |
| Standard atomic weight |
1.00794(7) g·mol−1 |
| Electron configuration |
1s1 |
| Electrons per shell |
1 |
| Physical properties |
| Phase |
gas |
| Density |
(0 °C, 101.325 kPa)
0.08988 g/L |
| Melting point |
14.01 K
(−259.14 °C, −434.45 °F) |
| Boiling point |
20.28 K
(−252.87 °C, −423.17 °F) |
| Triple point |
13.8033 K, 7.042 kPa |
| Critical point |
32.97 K, 1.293 MPa |
| Heat of fusion |
(H2) 0.117 kJ·mol−1 |
| Heat of vaporization |
(H2) 0.904 kJ·mol−1 |
| Heat capacity |
(25 °C) (H2)
28.836 J·mol−1·K−1 |
|
|
| Atomic properties |
| Crystal structure |
hexagonal |
| Oxidation states |
1, −1
(amphoteric oxide) |
| Electronegativity |
2.20 (Pauling scale) |
| Atomic radius |
25 pm |
| Atomic radius (calc.) |
53 pm |
| Covalent radius |
37 pm |
| Van der Waals radius |
120 pm |
| Miscellaneous |
| Thermal conductivity |
(300 K) 180.5 m W·m−1·K−1 |
| Speed of sound |
(gas, 27 °C) 1310 m/s |
| CAS registry number |
1333-74-0 |
| Selected isotopes |
|
|
| References |
|
Hydrogen Compounds
Hydrogen chloride
|
Source: Wikipedia article Hydrogen
|
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Chemistry Quick Facts
