Xenon-118

Properties and data of the isotope ¹¹⁸Xe.

Content

General data

Name of the isotope:Xenon-118; Xe-118Symbol:¹¹⁸Xe or 11854XeMass number A:118 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:64Isotopic mass:117.916179(11) u (atomic weight of Xenon-118)Nuclide mass:117.8865576 u (calculated nuclear mass without electrons)Mass excess:-78.07876 MeVMass defect:1.060927352 u (per nucleus)Nuclear binding energy:988.24746282 MeV (per nucleus)
8.3749785 MeV (average binding energy per nucleon)Separation energy:S_N = 11.965(15) MeV (first neutron)
S_P = 4.932(28) MeV (first proton)Half-life:3.8(9) minDecay constant λ:0.0030401192129822 s^-1Specific activity α:1.564788558254 × 10⁺¹⁹ Bq g^-1
422915826.5553 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.7387(70) femtometer fmYear of discovery:1965

Radioactive Decay

Half-life T_½ = 3.8(9) min (minutes) respectively 2.28 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹¹⁸I	100 %	2.892(22) MeV

Parent Nuclides

Direct parent isotope is: ¹¹⁸Cs.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 64) and isobaric (same nucleon number A = 118) with Xenon-118. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 64	Isobar A = 118
36	¹⁰⁰Kr
37	¹⁰¹Rb
38	¹⁰²Sr
39	¹⁰³Y
40	¹⁰⁴Zr
41	¹⁰⁵Nb
42	¹⁰⁶Mo	¹¹⁸Mo
43	¹⁰⁷Tc	¹¹⁸Tc
44	¹⁰⁸Ru	¹¹⁸Ru
45	¹⁰⁹Rh	¹¹⁸Rh
46	¹¹⁰Pd	¹¹⁸Pd
47	¹¹¹Ag	¹¹⁸Ag
48	¹¹²Cd	¹¹⁸Cd
49	¹¹³In	¹¹⁸In
50	¹¹⁴Sn	¹¹⁸Sn
51	¹¹⁵Sb	¹¹⁸Sb
52	¹¹⁶Te	¹¹⁸Te
53	¹¹⁷I	¹¹⁸I
54	¹¹⁸Xe	¹¹⁸Xe
55	¹¹⁹Cs	¹¹⁸Cs
56	¹²⁰Ba	¹¹⁸Ba
57	¹²¹La	¹¹⁸La
58	¹²²Ce
59	¹²³Pr
60	¹²⁴Nd