Template:Infobox hydrogen

<tr><td>Chemical series</td><td>nonmetals</td></tr> <tr><td>Appearance</td><td>colorless
<tr><td>Atomic radius</td><td>25pm</td></tr><tr><td>Atomic radius (calc.)</td><td>53 pm</td></tr><tr><td>Covalent radius</td><td>37 pm</td></tr><tr><td>Van der Waals radius</td><td>120 pm</td></tr> <tr><td>Thermal conductivity</td><td>(300 K) 180.5 m W·m⁻¹·K⁻¹</td></tr><tr><td>Speed of sound</td><td>(gas, 27 °C) 1310 m/s</td></tr><tr><td>CAS registry number</td><td>1333-74-0</td></tr>

1 (none) ← hydrogen → helium - ↑ H ↓ Li Periodic table - Extended periodic table
General
Name, symbol, number	hydrogen, H, 1
Group, period, block	1, 1, s
Standard atomic weight	1.00794(7) g·mol−1
Electron configuration	1s1
Electrons per shell	1
Physical properties<tr><td>Phase</td><td>gas</td></tr><tr><td>Density</td><td>(0 °C, 101.325 kPa) 0.08988 g/L</td></tr><tr><td>Melting point</td><td>14.01 K (−259.14 °C, −434.45 °F)</td></tr><tr><td>Boiling point</td><td>20.28 K (−252.87 °C, −423.17 °F)</td></tr><tr><td>Triple point</td><td>13.8033 K (-259°C), 7.042 kPa</td></tr><tr><td>Critical point</td><td>32.97 K, 1.293 MPa</td></tr><tr><td>Heat of fusion</td><td>(H2) 0.117 kJ·mol−1</td></tr><tr><td>Heat of vaporization</td><td>(H2) 0.904 kJ·mol−1</td></tr><tr><td>Heat capacity</td><td>(25 °C) (H2) 28.836 J·mol−1·K−1</td></tr>
Vapor pressure P/Pa 1 10 100 1 k 10 k 100 k at T/K         15 20
Atomic properties <tr><td>Crystal structure</td><td>hexagonal</td></tr><tr><td>Oxidation states</td><td>1, −1 (amphoteric oxide)</td></tr><tr><td>Electronegativity</td><td>2.20 (Pauling scale)</td></tr>
Miscellaneous
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