Selenium-74
Properties and data of the isotope 74Se.
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 ma | Quantity | Half-life | Spin |
---|
Selenium Isotopic mixture | 78.971 u | 100 % | | |
Isotope 74Se | 73.9224759(1) u | 0.86(3) % | stable | 0+ |
Isotope 76Se | 75.9192137(2) u | 9.23(7) % | stable | 0+ |
Isotope 77Se | 76.9199142(5) u | 7.60(7) % | stable | 1/2- |
Isotope 78Se | 77.917309(2) u | 23.69(22) % | stable | 0+ |
Isotope 80Se | 79.916522(8) u | 49.80(36) % | stable | 0+ |
Isotope 82Se | 81.916700(9) u | 8.82(15) % | 9.39(17) × 1019 a | 0+ |
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.
Z | Isotone N = 40 | Isobar A = 74 |
21 | 61Sc | |
22 | 62Ti | |
23 | 63V | |
24 | 64Cr | |
25 | 65Mn | |
26 | 66Fe | 74Fe |
27 | 67Co | 74Co |
28 | 68Ni | 74Ni |
29 | 69Cu | 74Cu |
30 | 70Zn | 74Zn |
31 | 71Ga | 74Ga |
32 | 72Ge | 74Ge |
33 | 73As | 74As |
34 | 74Se | 74Se |
35 | 75Br | 74Br |
36 | 76Kr | 74Kr |
37 | 77Rb | 74Rb |
38 | 78Sr | 74Sr |
39 | 79Y | |
40 | 80Zr | |
41 | 81Nb | |
42 | 82Mo | |
External data and identifiers
Last update: 2020-10-14
Perma link: https://www.chemlin.org/isotope/selenium-74
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