Hydrogen-2

Properties and data of the isotope ²H.

Contents

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:S_N = 2.22457(0) MeV (first neutron)
S_P = 2.22457(0) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μ_N) = + 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 m_a	Quantity	Half-life	Spin
Hydrogen Isotopic mixture	1.008 u	100 %
Isotope ³H	3.01604928132(8) u	[trace]	12.32(2) a	1/2+
Isotope ¹H	1.0078250322(6) u	99.99 % [99.972 - 99.999 %]	stable	1/2+
Isotope ²H	2.0141017781(8) u	0.01 % [0.001 - 0.028 %]	stable	1+

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/μ_N:+ 0.857438231(5)Gyromagnetic ratio γ:4.1066 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 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.