Krypton-86

Properties and data of the isotope ⁸⁶Kr.

Contents

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

General data

Name of the isotope:Krypton-86; Kr-86Symbol:⁸⁶Kr or 8636KrMass number A:86 (= number of nucleons)Atomic number Z:36 (= number of protons)Neutrons N:50Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3888888888889 (= neutron-proton ratio)Neutron excess (N-Z):14Isotopic mass:85.91061063(3) u (atomic weight of Krypton-86)Nuclide mass:85.8908625 u (calculated nuclear mass without electrons)Mass excess:-83.26566 MeVMass defect:0.804336322 u (per nucleus)Nuclear binding energy:749.23445793 MeV (per nucleus)
8.71202858 MeV (average binding energy per nucleon)Separation energy:S_N = 9.8566(20) MeV (first neutron)
S_P = 11.979(3) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.1835(21) femtometer fmYear of discovery:1920

Parent Nuclides

Direct parent isotopes are: ⁸⁶Br, ⁸⁶Rb, ⁸⁷Br.

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 ⁸⁰Kr	79.916378(5) u	2.286(10) %	stable	0+
Isotope ⁸²Kr	81.913483(6) u	11.593(31) %	stable	0+
Isotope ⁸⁴Kr	83.91149773(3) u	56.987(15) %	stable	0+
Isotope ⁸⁶Kr	85.91061063(3) u	17.279(41) %	stable	0+
Isotope ⁷⁸Kr	77.920365(5) u	0.355(3) %	stable	0+
Isotope ⁸³Kr	82.914126517(10) u	11.500(19) %	stable	9/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 50) and isobaric (same nucleon number A = 86) with Krypton-86. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 50	Isobar A = 86
28	⁷⁸Ni
29	⁷⁹Cu
30	⁸⁰Zn
31	⁸¹Ga	⁸⁶Ga
32	⁸²Ge	⁸⁶Ge
33	⁸³As	⁸⁶As
34	⁸⁴Se	⁸⁶Se
35	⁸⁵Br	⁸⁶Br
36	⁸⁶Kr	⁸⁶Kr
37	⁸⁷Rb	⁸⁶Rb
38	⁸⁸Sr	⁸⁶Sr
39	⁸⁹Y	⁸⁶Y
40	⁹⁰Zr	⁸⁶Zr
41	⁹¹Nb	⁸⁶Nb
42	⁹²Mo	⁸⁶Mo
43	⁹³Tc	⁸⁶Tc
44	⁹⁴Ru	⁸⁶Ru
45	⁹⁵Rh
46	⁹⁶Pd
47	⁹⁷Ag
48	⁹⁸Cd
49	⁹⁹In
50	¹⁰⁰Sn