Ruthenium-104

Properties and data of the isotope ¹⁰⁴Ru.

Content

General data

Name of the isotope:Ruthenium-104; Ru-104Symbol:¹⁰⁴Ru or 10444RuMass number A:104 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:60Isotopic mass:103.90543(2) u (atomic weight of Ruthenium-104)Nuclide mass:103.8812937 u (calculated nuclear mass without electrons)Mass excess:-88.09139 MeVMass defect:0.958766368 u (per nucleus)Nuclear binding energy:893.08511919 MeV (per nucleus)
8.58735692 MeV (average binding energy per nucleon)Separation energy:S_N = 8.8999(25) MeV (first neutron)
S_P = 10.781(9) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.5098(20) femtometer fmYear of discovery:1931

Parent Nuclides

Direct parent isotopes are: ¹⁰⁴Rh, ¹⁰⁴Tc.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Ruthenium Isotopic mixture	101.07 u	100 %
Isotope ⁹⁶Ru	95.907590(3) u	5.54(14) %	stable	0+
Isotope ⁹⁸Ru	97.90529(5) u	1.87(3) %	stable	0+
Isotope ⁹⁹Ru	98.905934(7) u	12.76(14) %	stable	5/2+
Isotope ¹⁰⁰Ru	99.904214(7) u	12.60(7) %	stable	0+
Isotope ¹⁰¹Ru	100.905577(8) u	17.06(2) %	stable	5/2+
Isotope ¹⁰²Ru	101.904344(8) u	31.55(14) %	stable	0+
Isotope ¹⁰⁴Ru	103.90543(2) u	18.62(27) %	stable	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 = 104) with Ruthenium-104. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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