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Selenium-74

Properties and data of the isotope 74Se.


Contents

 

Selenium-74 isotope

See also: list of Selenium isotopes.

 

General data

Name of the isotope:Selenium-74; Se-74Symbol:74Se or 7434SeMass number A:74 (= number of nucleons)Atomic number Z:34 (= number of protons)Neutrons N:40Isotopic mass:73.9224759(1) u (atomic weight of Selenium-74)Nuclide mass:73.9038248 u (calculated nuclear mass without electrons)Mass excess:-72.21323 MeVMass defect:0.690171828 u (per nucleus)Nuclear binding energy:642.89091675 MeV (per nucleus)
8.68771509 MeV (average binding energy per nucleon)
Separation energy:SN = 12.057(7) MeV (first neutron)
SP = 8.549(4) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
0+Charge radius:4.07(2) femtometer fmYear of discovery:1922

 

Parent Nuclides

Direct parent isotopes are: 74Br, 74As.

 

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 = 40) and isobaric (same nucleon number A = 74) with Selenium-74. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 40Isobar A = 74
2161Sc
2262Ti
2363V
2464Cr
2565Mn
2666Fe74Fe
2767Co74Co
2868Ni74Ni
2969Cu74Cu
3070Zn74Zn
3171Ga74Ga
3272Ge74Ge
3373As74As
3474Se74Se
3575Br74Br
3676Kr74Kr
3777Rb74Rb
3878Sr74Sr
3979Y
4080Zr
4181Nb
4282Mo

 

External data and identifiers

Adopted Levels, Gammas:NuDat 74Se

 


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Last update: 2020-10-14


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