|
|
| Appearance |
| colorless gas |
| General |
| Name, symbol, number |
hydrogen, H, 1 |
| Element category |
nonmetal |
| Group, period, block |
1, 1, s |
| Standard atomic weight |
1.00794(7) g·mol−1 |
| Electron configuration |
1s1 |
| Electrons per shell |
1 (Image) |
| 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 (-259°C), 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 |
| Specific heat capacity |
(25 °C) (H2)
28.836 J·mol−1·K−1 |
| Vapor pressure |
| P/Pa |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T/K |
|
|
|
|
15 |
20 |
|
| Atomic properties |
| Oxidation states |
1, −1
(amphoteric oxide) |
| Electronegativity |
2.20 (Pauling scale) |
| Ionization energies |
1st: 1312.0 kJ·mol−1 |
| Covalent radius |
31±5 pm |
| Van der Waals radius |
120 pm |
| Miscellaneous |
| Crystal structure |
hexagonal |
| Magnetic ordering |
diamagnetic[1] |
| 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 |
| Most stable isotopes |
| Main article: Isotopes of hydrogen |
|
|
|
|
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