Molecule
Name
Hydrogen
IUPAC name
Dihydrogen
Secondary names
Dihydrogen, molecular hydrogen, H2
InChI
InChI=1S/H2/h1H
InChI key
UFHFLCQGNIYNRP-UHFFFAOYSA-N
CAS number
1333-74-0
Comments
natural H2
Formula
H2
Chemical formula
H2
Structural formula
[H][H]
Charge
0
Unpaired electrons
0
  Atom Name Number
H Hydrogen 2
Relations
  • no
Isotope mixture type
terrestrial abundance
Isotopes
  Isotope Mole fraction
1H2 0.99977
HD 0.00022997
D2 1.323e-08
Spin type
equilibrated
Spin quantum numbers
0, 1
Molar mass
2.01588 g/mol
State STP
gas
Protic
protic
Polarity
nonpolar
Dipole
0.0 D
Molecule symmetry
Dinfh
Case
diatomic
Vibrations number
1
Vibrations
Label Mode Bond Symmetry Degeneracy Fundamental frequency Observed frequency Observed frequency Harmonic frequency Activity IR Activity Raman Strength Comments
V1 stretching HH A1 no 4161.0 4401.21 inactive active ia intensity is vvw
Comments
Vibrations of the main isotope: 1H2. Data from VPL database and NIST Chemistry WebBook
Chemical bonds
  Bond Number
HH 1