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Selenium-78

Properties and data of the isotope 78Se.


Content

See also: list of Selenium isotopes.

 

General data

Name of the isotope:Selenium-78; Se-78Symbol:78Se or 7834SeMass number A:78 (= number of nucleons)Atomic number Z:34 (= number of protons)Neutrons N:44Isotopic mass:77.917309(2) u (atomic weight of Selenium-78)Nuclide mass:77.8986579 u (calculated nuclear mass without electrons)Mass excess:-77.02617 MeVMass defect:0.729998392 u (per nucleus)Nuclear binding energy:679.98912216 MeV (per nucleus)
8.71780926 MeV (average binding energy per nucleon)
Separation energy:SN = 10.49777(17) MeV (first neutron)
SP = 10.3986(17) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
0+Charge radius:4.1406(17) femtometer fmYear of discovery:1922

 

Parent Nuclides

Direct parent isotopes are: 78Br, 78As.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Selenium
Isotopic mixture
78.971 u100 %
Isotope 74Se73.9224759(1) u0.86(3) %stable0+
Isotope 76Se75.9192137(2) u9.23(7) %stable0+
Isotope 77Se76.9199142(5) u7.60(7) %stable1/2-
Isotope 78Se77.917309(2) u23.69(22) %stable0+
Isotope 80Se79.916522(8) u49.80(36) %stable0+
Isotope 82Se81.916700(9) u8.82(15) %9.39(17) × 1019 a0+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 44) and isobaric (same nucleon number A = 78) with Selenium-78. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 44Isobar A = 78
2367V
2468Cr
2569Mn
2670Fe
2771Co
2872Ni78Ni
2973Cu78Cu
3074Zn78Zn
3175Ga78Ga
3276Ge78Ge
3377As78As
3478Se78Se
3579Br78Br
3680Kr78Kr
3781Rb78Rb
3882Sr78Sr
3983Y78Y
4084Zr78Zr
4185Nb
4286Mo
4387Tc
4488Ru
4589Rh
4690Pd

 

External data and identifiers

Adopted Levels, Gammas:NuDat 78Se

 


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Last update: 2020-10-14


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