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 (-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
Crystal structure	hexagonal
Oxidation states	1, −1 (amphoteric oxide)
Electronegativity	2.20 (Pauling scale)
Ionization energies	1st: 1312.0 kJ·mol−1
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% 1H is stable with 0 neutrons 2H 0.015% 2H is stable with 1 neutrons 3H trace 12.32 y β− 0.019 3He
References
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