Template:Infobox hydrogen

Hydrogen, ₀₀Hydrogen helium

Hydrogen
Appearance	colorless gas
Hydrogen in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson - ↑ Hydrogen helium ↓ Li (none)of the above haha ← hydrogen → helium
Electrons per shell	1
Physical properties
Phase at STP	gas
Melting point	14.01 K ​(−259.14 °C, ​−434.45 °F)
Boiling point	20.28 K ​(−252.87 °C, ​−423.17 °F)
Density (at STP)	0.08988 g/L
Triple point	13.8033 K, ​7.042 kPa
Critical point	32.97 K, 1.293 MPa
Heat of fusion	(H2) 0.117 kJ/mol
Heat of vaporization	(H2) 0.904 kJ/mol
Molar heat capacity	(H2) 28.836 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K)         15 20
Atomic properties
Oxidation states	common:
Electronegativity	Pauling scale: 2.20
Atomic radius	empirical: 25 pm calculated: 53 pm
Covalent radius	37 pm
Van der Waals radius	120 pm
Other properties
Crystal structure	​hexagonal
Thermal conductivity	180.5 m W/(m⋅K)
Speed of sound	(gas, 27 °C) 1310 m/s
CAS Number	1333-74-0
Isotopes of hydrogen
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 1H 99.9855% stable 2H 0.0145% stable 3H trace 12.32 y β− 3He