Selenium-82

Properties and data of the isotope ⁸²Se.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

See also: List of individual Selenium isotopes (and general data sources).

General data

Name of the isotope:Selenium-82; Se-82Symbol:⁸²Se or 8234SeMass number A:82 (= number of nucleons)Atomic number Z:34 (= number of protons)Neutrons N:48Isotopic mass:81.916700(9) u (atomic weight of Selenium-82)Nuclide mass:81.8980489 u (calculated nuclear mass without electrons)Mass excess:-77.59345 MeVMass defect:0.765267056 u (per nucleus)Nuclear binding energy:712.84167106 MeV (per nucleus)
8.69319111 MeV (average binding energy per nucleon)Separation energy:S_N = 9.2762(10) MeV (first neutron)
S_P = 12.3495(27) MeV (first proton)Half-life:9.39(17) × 10¹⁹ aDecay constant λ:2.340740458965 × 10^-28 s^-1Specific activity α:1.740280093882 × 10^-6 Bq g^-1
4.703459713194 × 10^-17 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.1400(19) femtometer fmYear of discovery:1922

Radioactive Decay

Half-life T_½ = 9.39(17) × 10¹⁹ a respectively 2.9612304 × 10²⁷ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
2β^-	⁸²Kr	100 %

Parent Nuclides

Direct parent isotope is: ⁸²As.

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 = 48) and isobaric (same nucleon number A = 82) with Selenium-82. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 48	Isobar A = 82
26	⁷⁴Fe
27	⁷⁵Co
28	⁷⁶Ni
29	⁷⁷Cu	⁸²Cu
30	⁷⁸Zn	⁸²Zn
31	⁷⁹Ga	⁸²Ga
32	⁸⁰Ge	⁸²Ge
33	⁸¹As	⁸²As
34	⁸²Se	⁸²Se
35	⁸³Br	⁸²Br
36	⁸⁴Kr	⁸²Kr
37	⁸⁵Rb	⁸²Rb
38	⁸⁶Sr	⁸²Sr
39	⁸⁷Y	⁸²Y
40	⁸⁸Zr	⁸²Zr
41	⁸⁹Nb	⁸²Nb
42	⁹⁰Mo	⁸²Mo
43	⁹¹Tc
44	⁹²Ru
45	⁹³Rh
46	⁹⁴Pd
47	⁹⁵Ag
48	⁹⁶Cd
49	⁹⁷In
50	⁹⁸Sn