Ruthenium-100

Properties and data of the isotope ¹⁰⁰Ru.

Content

General data

Name of the isotope:Ruthenium-100; Ru-100Symbol:¹⁰⁰Ru or 10044RuMass number A:100 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:56Isotopic mass:99.904214(7) u (atomic weight of Ruthenium-100)Nuclide mass:99.8800777 u (calculated nuclear mass without electrons)Mass excess:-89.22408 MeVMass defect:0.92532270400001 u (per nucleus)Nuclear binding energy:861.93254684 MeV (per nucleus)
8.61932547 MeV (average binding energy per nucleon)Separation energy:S_N = 9.67332(3) MeV (first neutron)
S_P = 9.1885(9) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.4531(31) femtometer fmYear of discovery:1931

Parent Nuclides

Direct parent isotopes are: ¹⁰⁰Rh, ¹⁰⁰Tc, ¹⁰⁰Mo.

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 = 56) and isobaric (same nucleon number A = 100) with Ruthenium-100. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 56	Isobar A = 100
31	⁸⁷Ga
32	⁸⁸Ge
33	⁸⁹As
34	⁹⁰Se
35	⁹¹Br
36	⁹²Kr	¹⁰⁰Kr
37	⁹³Rb	¹⁰⁰Rb
38	⁹⁴Sr	¹⁰⁰Sr
39	⁹⁵Y	¹⁰⁰Y
40	⁹⁶Zr	¹⁰⁰Zr
41	⁹⁷Nb	¹⁰⁰Nb
42	⁹⁸Mo	¹⁰⁰Mo
43	⁹⁹Tc	¹⁰⁰Tc
44	¹⁰⁰Ru	¹⁰⁰Ru
45	¹⁰¹Rh	¹⁰⁰Rh
46	¹⁰²Pd	¹⁰⁰Pd
47	¹⁰³Ag	¹⁰⁰Ag
48	¹⁰⁴Cd	¹⁰⁰Cd
49	¹⁰⁵In	¹⁰⁰In
50	¹⁰⁶Sn	¹⁰⁰Sn
51	¹⁰⁷Sb
52	¹⁰⁸Te
53	¹⁰⁹I
54	¹¹⁰Xe