Template:Infobox hydrogen

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1 (none) ← hydrogen → helium - ↑ H ↓ Li Periodic Table - Extended Periodic Table
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
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K         15 20
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
Main article: Isotopes of hydrogen iso NA half-life DM DE (MeV) DP 1H 99.985% H is stable with 0 neutrons 2H 0.0115% H is stable with 1 neutrons 3H trace 12.32 y β− 0.019 3He
References
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