Periodic table of the elements
HydrogenHelium
1
H
Hydrogen
1.00794
1
1
H
Hydrogen
1.00794
1
General
NameHydrogen
SymbolH
Number1
Chemical series
Group / Period1 / 1
Blocks-block
CAS registry number1333-74-0

Physical properties
Stategas
Density0.08988 g/L
Melting point14.01 K (−259.14 °C, −434.45 °F)
Boiling point20.28 K (−252.87 °C, −423.17 °F)
Critical point32.97 K, 1.293 MPa

Atomic properties
Atomic Weight1.00794 g/mol
Crystal structurehexagonal
Electronegativity2.20
Atomic radius25 pm
Atomic radius (calculated)53 pm
Electron configuration1s1
Electrons per shell1
Number of protons1
Number of neutrons0

Other languages
SpanishHidrógeno
PortugueseHidrogénio
FrenchHydrogène
GermanWasserstoff
ItalianIdrogeno
RussianВодород
PolishWodór
Chinese
Arabicهيدروجين
TurkishHidrojen
DutchWaterstof


Periodic table of the elements
HydrogenHelium