Krypton-82

Properties and data of the isotope ⁸²Kr.

Contents

General data

Name of the isotope:Krypton-82; Kr-82Symbol:⁸²Kr or 8236KrMass number A:82 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:46Isotopic mass:81.913483(6) u (atomic weight of Krypton-82)Nuclide mass:81.8937349 u (calculated nuclear mass without electrons)Mass excess:-80.59007 MeVMass defect:0.766804288 u (per nucleus)Nuclear binding energy:714.27359345 MeV (per nucleus)
8.71065358 MeV (average binding energy per nucleon)Separation energy:S_N = 10.9669(11) MeV (first neutron)
S_P = 9.9037(10) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.1919(25) femtometer fmYear of discovery:1920

Parent Nuclides

Direct parent isotopes are: ⁸²Rb, ⁸²Br, ⁸²Se.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Krypton Isotopic mixture	83.798 u	100 %
Isotope ⁷⁸Kr	77.920365(5) u	0.355(3) %	stable	0+
Isotope ⁸⁰Kr	79.916378(5) u	2.286(10) %	stable	0+
Isotope ⁸²Kr	81.913483(6) u	11.593(31) %	stable	0+
Isotope ⁸³Kr	82.914127(2) u	11.500(19) %	stable	9/2+
Isotope ⁸⁴Kr	83.91149773(3) u	56.987(15) %	stable	0+
Isotope ⁸⁶Kr	85.91061063(3) u	17.279(41) %	stable	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 = 82) with Krypton-82. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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