GENERAL PROPERTIES OF HYDROGEN
Standard atomic weight | [1.00784, 1.00811] conventional: 1.008 |
Appearance | colorless |
Atomic Number | 1 |
Group number | 1 |
Period number | 1 |
Block | s-block element |
Electron per Shell | 1 |
Category of the element | Diatomic non metal |
Electronic configuration | 1S1 |
physical properties
Color | colorless |
Melting point | 13.99K |
Boiling Point | 20.271K |
Molar heat capacity | (H2) 28.836J/(mol.k) |
Heat of evaporation | (H2) 0.904kJ.mol |
Critical point | 32.938K |
Heat of fusion | (H2) 0.117kJ/mol |
Triple point | 13.8033K |
Liquid at boiling point | 0.07099g/cm3 |
Liquid at melting point | 0.07g/cm3 |
Phase at standard temperature and pressure | gas |
Density at standard temperature and pressure | 0.08988g/L |
Atomic properties
Van der wall radius | 120pm |
Covalent radius | 31 ±5pm |
Oxidation state | -1, +1 an amphoteric oxide |
Ionization energy | First ionization energy: 1312.0kj/mol |
Electronegativity | Pauline scale: 2.20 |
others properties
Speed of sound | 1310m/s (gas, 27°C |
Crystal structure | Hexagonal |
Thermal conductivity | 0.1805W/m.k |
Magnetic susceptibility | -3.98 x 10-6cm3/mole (298K) |
Magnetic ordering | Diamagnetic |
CAS number | 12385-13-6 and 1333-74-0-(H2) |
Discover by | Henry Cavendish (1766) |
Name by | Antoine Lavoisier (1783) |
Hydrogen Isotope
Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
1H | 99.98% | stable | ||
2H | 0.02% | Stable | ||
3H | Trace | 12.32 years | β- | 3He |
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