Selenium-80

Properties and data of the isotope ⁸⁰Se.

Contents

General data

Name of the isotope:Selenium-80; Se-80Symbol:⁸⁰Se or 8034SeMass number A:80 (= number of nucleons)Atomic number Z:34 (= number of protons)Neutrons N:46Isotopic mass:79.916522(8) u (atomic weight of Selenium-80)Nuclide mass:79.8978709 u (calculated nuclear mass without electrons)Mass excess:-77.75926 MeVMass defect:0.748115224 u (per nucleus)Nuclear binding energy:696.86484246 MeV (per nucleus)
8.71081053 MeV (average binding energy per nucleon)Separation energy:S_N = 9.9133(10) MeV (first neutron)
S_P = 11.412(5) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.1400(18) femtometer fmYear of discovery:1922

Radioactive Decay

Half-life T_½ = stable.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
2 β^-?

Parent Nuclides

Direct parent isotopes are: ⁸⁰As, ⁸⁰Br.

Occurrence

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

	Atomic Mass m_a	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 = 46) and isobaric (same nucleon number A = 80) with Selenium-80. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 46	Isobar A = 80
25	⁷¹Mn
26	⁷²Fe
27	⁷³Co
28	⁷⁴Ni	⁸⁰Ni
29	⁷⁵Cu	⁸⁰Cu
30	⁷⁶Zn	⁸⁰Zn
31	⁷⁷Ga	⁸⁰Ga
32	⁷⁸Ge	⁸⁰Ge
33	⁷⁹As	⁸⁰As
34	⁸⁰Se	⁸⁰Se
35	⁸¹Br	⁸⁰Br
36	⁸²Kr	⁸⁰Kr
37	⁸³Rb	⁸⁰Rb
38	⁸⁴Sr	⁸⁰Sr
39	⁸⁵Y	⁸⁰Y
40	⁸⁶Zr	⁸⁰Zr
41	⁸⁷Nb
42	⁸⁸Mo
43	⁸⁹Tc
44	⁹⁰Ru
45	⁹¹Rh
46	⁹²Pd
47	⁹³Ag
48	⁹⁴Cd