Ruthenium-118

Properties and data of the isotope ¹¹⁸Ru.

Content

General data

Name of the isotope:Ruthenium-118; Ru-118Symbol:¹¹⁸Ru or 11844RuMass number A:118 (= number of nucleons)Atomic number Z:44 (= number of protons)Neutrons N:74Isotopic mass:117.93853(21) u (atomic weight of Ruthenium-118)Nuclide mass:117.9143937 u (calculated nuclear mass without electrons)Mass excess:-57.25894 MeVMass defect:1.046975192 u (per nucleus)Nuclear binding energy:975.2511095 MeV (per nucleus)
8.26483991 MeV (average binding energy per nucleon)Separation energy:S_N = 5.84(48) MeV (first neutron)
S_P = 16.17(45) MeV (first proton)Half-life:99(3) msDecay constant λ:7.0014866723227 s^-1Specific activity α:3.603755467495 × 10⁺²² Bq g^-1
973987964187.97 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1994

Radioactive Decay

Half-life T_½ = 99(3) ms respectively 9.9 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹¹⁸Rh		7.63(20) MeV
β^-, n	¹¹⁷Rh	?	3.57(20) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 74) and isobaric (same nucleon number A = 118) with Ruthenium-118. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 74	Isobar A = 118
41	¹¹⁵Nb
42	¹¹⁶Mo	¹¹⁸Mo
43	¹¹⁷Tc	¹¹⁸Tc
44	¹¹⁸Ru	¹¹⁸Ru
45	¹¹⁹Rh	¹¹⁸Rh
46	¹²⁰Pd	¹¹⁸Pd
47	¹²¹Ag	¹¹⁸Ag
48	¹²²Cd	¹¹⁸Cd
49	¹²³In	¹¹⁸In
50	¹²⁴Sn	¹¹⁸Sn
51	¹²⁵Sb	¹¹⁸Sb
52	¹²⁶Te	¹¹⁸Te
53	¹²⁷I	¹¹⁸I
54	¹²⁸Xe	¹¹⁸Xe
55	¹²⁹Cs	¹¹⁸Cs
56	¹³⁰Ba	¹¹⁸Ba
57	¹³¹La	¹¹⁸La
58	¹³²Ce
59	¹³³Pr
60	¹³⁴Nd
61	¹³⁵Pm
62	¹³⁶Sm
63	¹³⁷Eu
64	¹³⁸Gd
65	¹³⁹Tb
66	¹⁴⁰Dy
67	¹⁴¹Ho