Cadmium-108

Properties and data of the isotope ¹⁰⁸Cd.

Contents

General data

Name of the isotope:Cadmium-108; Cd-108Symbol:¹⁰⁸Cd or 10848CdMass number A:108 (= number of nucleons)Atomic number Z:48 (= number of protons)Neutrons N:60Isotopic mass:107.904183(8) u (atomic weight of Cadmium-108)Nuclide mass:107.8778526 u (calculated nuclear mass without electrons)Mass excess:-89.25296 MeVMass defect:0.99131349599999 u (per nucleus)Nuclear binding energy:923.40257364 MeV (per nucleus)
8.55002383 MeV (average binding energy per nucleon)Separation energy:S_N = 10.3335(20) MeV (first neutron)
S_P = 8.1347(26) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.5577(31) femtometer fmYear of discovery:1935

Radioactive Decay

Half-life T_½ = stable.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
2 β⁺ ?	¹⁰⁸Pd

Parent Nuclides

Direct parent isotopes are: ¹⁰⁸In, ¹⁰⁸Ag.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Cadmium Isotopic mixture	112.414 u	100 %
Isotope ¹⁰⁶Cd	105.906460(8) u	1.245(22) %	stable	0+
Isotope ¹⁰⁸Cd	107.904183(8) u	0.888(11) %	stable	0+
Isotope ¹¹⁰Cd	109.903007(4) u	12.470(61) %	stable	0+
Isotope ¹¹¹Cd	110.904183(4) u	12.795(12) %	stable	1/2+
Isotope ¹¹²Cd	111.902763(4) u	24.109(7) %	stable	0+
Isotope ¹¹³Cd	112.904408(3) u	12.227(7) %	8.04(5) × 10¹⁵ a	1/2+
Isotope ¹¹⁴Cd	113.903365(3) u	28.754(81) %	stable	0+
Isotope ¹¹⁶Cd	115.904763(2) u	7.512(54) %	3.3(4) × 10¹⁹ a	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 60) and isobaric (same nucleon number A = 108) with Cadmium-108. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 60	Isobar A = 108
34	⁹⁴Se
35	⁹⁵Br
36	⁹⁶Kr
37	⁹⁷Rb
38	⁹⁸Sr
39	⁹⁹Y	¹⁰⁸Y
40	¹⁰⁰Zr	¹⁰⁸Zr
41	¹⁰¹Nb	¹⁰⁸Nb
42	¹⁰²Mo	¹⁰⁸Mo
43	¹⁰³Tc	¹⁰⁸Tc
44	¹⁰⁴Ru	¹⁰⁸Ru
45	¹⁰⁵Rh	¹⁰⁸Rh
46	¹⁰⁶Pd	¹⁰⁸Pd
47	¹⁰⁷Ag	¹⁰⁸Ag
48	¹⁰⁸Cd	¹⁰⁸Cd
49	¹⁰⁹In	¹⁰⁸In
50	¹¹⁰Sn	¹⁰⁸Sn
51	¹¹¹Sb	¹⁰⁸Sb
52	¹¹²Te	¹⁰⁸Te
53	¹¹³I	¹⁰⁸I
54	¹¹⁴Xe
55	¹¹⁵Cs
56	¹¹⁶Ba
57	¹¹⁷La