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 $H_2$
Structure and atomic composition
Formula
$H_2$
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
$^1H_2$ 0.99977
$HD$ 0.00022997
$D_2$ 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 $H-H$ $A_{1}$ no 4161.0 4401.21 inactive active ia intensity is vvw
Comments
Vibrations of the main isotope: $^1H_2$. Data from VPL database and NIST Chemistry WebBook
Chemical bonds
  Bond Number
$H-H$ 1