Input interpretation
hydrogen (chemical element)
Periodic table location
Periodic table location
Image
Image
Basic elemental properties
atomic symbol | H atomic number | 1 short electronic configuration | 1s^1 Aufbau diagram | 1s block | s group | 1 period | 1 atomic mass | 1.008 u (unified atomic mass units)
Thermodynamic properties
phase at STP | gas melting point | -259.14 °C (rank: 101st) boiling point | -252.87 °C (rank: 93rd) critical temperature | 32.97 K (rank: 20th) critical pressure | 1.293 MPa (rank: 20th) molar heat of fusion | 0.558 kJ/mol (rank: 88th) molar heat of vaporization | 0.452 kJ/mol (rank: 93rd) specific heat at STP | 14300 J/(kg K) (rank: 1st) adiabatic index | 7/5 (rank: 1st) (properties at standard conditions)
Material properties
density | 8.99×10^-5 g/cm^3 (rank: 96th) molar volume | 11200 cm^3/mol refractive index | 1.000132 sound speed | 1270 m/s (rank: 61st) thermal conductivity | 0.1805 W/(m K) (rank: 83rd) (properties at standard conditions)
Electromagnetic properties
magnetic type | diamagnetic volume magnetic susceptibility | -2.23×10^-9 mass magnetic susceptibility | -2.48×10^-8 m^3/kg (cubic meters per kilogram) molar magnetic susceptibility | -4.999×10^-11 m^3/mol (cubic meters per mole) color | (colorless) refractive index | 1.000132
Reactivity
valence | 1 electronegativity | 2.2 electron affinity | 72.8 kJ/mol (kilojoules per mole) first ionization energy | 1312 kJ/mol (kilojoules per mole) ionization energies | 1312 kJ/mol
Atomic properties
term symbol | ^2S_(1/2) atomic radius | 25 pm covalent radius | 31 pm van der Waals radius | 120 pm (electronic ground state properties)
(neutral hydrogen atomic spectrum)
Abundances
universe abundance | 75 mass% (rank: 1st) solar abundance | 75 mass% (rank: 1st) meteorite abundance | 2.4 mass% (rank: 6th) crust abundance | 0.15 mass% (rank: 11th) ocean abundance | 11 mass% (rank: 2nd) human abundance | 10 mass% (rank: 3rd) universe molar abundance | 93 mol% (rank: 1st) solar molar abundance | 93 mol% (rank: 1st) meteorite molar abundance | 17 mol% (rank: 2nd) ocean molar abundance | 66 mol% (rank: 1st) crust molar abundance | 3.1 mol% (rank: 4th) human molar abundance | 62 mol% (rank: 1st)
Nuclear properties
half-life | (stable) stable isotopes | H-1 (99.985%) | H-2 (1.5×10^-4) nuclear spin | H-1: 1/2^+ | H-2: 1^+ | H-3: 1/2^+ | H-4: 2^- | H-5: 1/2^+ | H-6: 2^- | H-7: 1/2^+ unstable isotopes | H-3 (12.32 yr) | H-6 (0.29 zs) | H-4 (0.139 zs) | H-5 (0.08 zs) | H-7 (0.023 zs) neutron cross-section | 0.332 b neutron mass absorption | 0.011 m^2/kg
Identifiers
CAS number | 1333-74-0 PubChem CID number | 783