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Properties and data of the isotope 1H.


See also: list of Hydrogen isotopes.


General data

Name of the isotope:Hydrogen-1; H-1Namen:ProtiumSymbol:1HMass number A:1Atomic number Z:1 (= number of protons)Neutrons N:0Isotopic mass:1.0078250322(6) u (atomic weight of Hydrogen-1)Nuclide mass:1.0072765 u (calculated nuclear mass without electrons)Mass excess:7.28897 MeVMass defect:-2.0000001654807E-10 u (per nucleus)Nuclear binding energy:-1.9E-7 MeV (per nucleus)
-1.9E-7 MeV (average binding energy per nucleon)
Half-life:stableSpin and parity:1/2+Charge radius:0.8783(86) femtometer fmYear of discovery:1920


Parent Nuclides

Direct parent isotope is: 9B.



Comparison of the natural Wasserstoff isotopes including isotopic abundance (proportion of the isotope mixture):


Atomic Mass maQuantityHalf-lifeSpin
Isotopic mixture
1,008 u100 %
Isotope 1H1,0078250322(6) u99,99 %stable1/2+
Isotope 2H2,0141017781(8) u0,01 %stable1+
Isotope 3H3,01604928132(8) u12.32(2) a1/2+


NMR data

1H belongs to the NMR active Nuclides.

Isotope:1H-NMRQuantity:99,99 % [99,972 - 99,999 %]Spin:1/2+Nuclearmagnetic moment
+ 2,792847351(9)Gyromagnetic ratio
107 rad T-1 s-1:
26,675222Resonance frequency
v0 at 1 T:
42,5759Relative Sensitivity:1,00000 (H0 = const.)
1,00000 (v0 = const.)
[related to 1H = 1,000]


Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 0) and isobaric (same nucleon number A = 1) with Hydrogen-1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.


OZIsotone N = 0Isobar A = 1


External data and identifiers

Adopted Levels, Gammas:NuDat 1H


Category: Isotopes

Last update: 28.01.2022

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