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Hydrogen-2

Properties and data of the isotope 2H.


Content

 

Hydrogen-2 isotope

See also: list of Hydrogen isotopes.

 

General data

Name of the isotope:Hydrogen-2; H-2Other names:DeuteriumSymbol:2H or 21HMass number A:2 (= number of nucleons)Atomic number Z:1 (= number of protons)Neutrons N:1Isotopic mass:2.0141017781(8) u (atomic weight of Hydrogen-2)Nuclide mass:2.0135532 u (calculated nuclear mass without electrons)Mass excess:13.13572 MeVMass defect:0.0023881699000001 u (per nucleus)Nuclear binding energy:2.22456593 MeV (per nucleus)
1.11228297 MeV (average binding energy per nucleon)
Separation energy:SN = 2.22457(0) MeV (first neutron)
SP = 2.22457(0) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
1+Magnetic dipole moment:μ(μN) = + 0.857438231(5)Charge radius:2.1421(88) femtometer fmYear of discovery:1932

 

Occurrence

Comparison of the natural Hydrogen isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Hydrogen
Isotopic mixture
1.008 u100 %
Isotope 3H3.01604928132(8) u
[trace]
12.32(2) a1/2+
Isotope 1H1.0078250322(6) u99.99 %
[99.972 - 99.999 %]
stable1/2+
Isotope 2H2.0141017781(8) u0.01 %
[0.001 - 0.028 %]
stable1+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 2H

Isotope:2H-NMRQuantity:0.01 % [0.001 - 0.028 %]Spin:1+Nuclearmagnetic moment
μ/μN:
+ 0.857438231(5)Gyromagnetic ratio γ:4.1066 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.857438231Quadrupole moment Q:+0.0028578(3) barn (100 fm2)Line width parameter (factor):l = 0.41 fm4Resonance frequency:v0 = 6.5359 at 1 TFrequency ratio:Ξ(2H) = 15.350609 %Relative Sensitivity:0.00965 (H0 = const.)
0.4094 (v0 = const.)
[related to 1H = 1.000]
Reference compound:
(conditions)
Pure tetramethylsilane-d12 ((CD3)4Si, neat).

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 1) and isobaric (same nucleon number A = 2) with Hydrogen-2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 1Isobar A = 2
12H2H
23He
34Li
45Be
56B

 

External data and identifiers

CAS:7782-39-0InChI Key:UFHFLCQGNIYNRP-VVKOMZTBSA-NAdopted Levels, Gammas:NuDat 2H

 


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Last update: 2023-11-30


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