Lanthanum-118

Properties and data of the isotope ¹¹⁸La.

Contents

General data

Name of the isotope:Lanthanum-118; La-118Symbol:¹¹⁸La or 11857LaMass number A:118 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:61Isotopic mass:117.94673(32) u (atomic weight of Lanthanum-118)Nuclide mass:117.9154631 u (calculated nuclear mass without electrons)Mass excess:-49.62069 MeVMass defect:1.0278567 u (per nucleus)Nuclear binding energy:957.44234891 MeV (per nucleus)
8.11391821 MeV (average binding energy per nucleon)Half-life:~200 msDecay constant λ:3.4657359027997 s^-1Specific activity α:1.783858956410 × 10⁺²² Bq g^-1
482124042273.05 Ci g^-1Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Half-life T_½ = ~200 ms respectively 2 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹¹⁸Ba
β⁺

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 61) and isobaric (same nucleon number A = 118) with Lanthanum-118. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 61	Isobar A = 118
34	⁹⁵Se
35	⁹⁶Br
36	⁹⁷Kr
37	⁹⁸Rb
38	⁹⁹Sr
39	¹⁰⁰Y
40	¹⁰¹Zr
41	¹⁰²Nb
42	¹⁰³Mo	¹¹⁸Mo
43	¹⁰⁴Tc	¹¹⁸Tc
44	¹⁰⁵Ru	¹¹⁸Ru
45	¹⁰⁶Rh	¹¹⁸Rh
46	¹⁰⁷Pd	¹¹⁸Pd
47	¹⁰⁸Ag	¹¹⁸Ag
48	¹⁰⁹Cd	¹¹⁸Cd
49	¹¹⁰In	¹¹⁸In
50	¹¹¹Sn	¹¹⁸Sn
51	¹¹²Sb	¹¹⁸Sb
52	¹¹³Te	¹¹⁸Te
53	¹¹⁴I	¹¹⁸I
54	¹¹⁵Xe	¹¹⁸Xe
55	¹¹⁶Cs	¹¹⁸Cs
56	¹¹⁷Ba	¹¹⁸Ba
57	¹¹⁸La	¹¹⁸La
58	¹¹⁹Ce