Bismuth-218

Properties and data of the isotope ²¹⁸Bi.

Contents

General data

Name of the isotope:Bismuth-218; Bi-218Symbol:²¹⁸Bi or 21883BiMass number A:218 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:135Isotopic mass:218.014188(29) u (atomic weight of Bismuth-218)Nuclide mass:217.9686611 u (calculated nuclear mass without electrons)Mass excess:13.21604 MeVMass defect:1.805053316 u (per nucleus)Nuclear binding energy:1681.39633353 MeV (per nucleus)
7.71282722 MeV (average binding energy per nucleon)Separation energy:S_N = 3.59(3) MeV (first neutron)
S_P = 6.31(30) MeV (first proton)Half-life:33(1) sDecay constant λ:0.021004460016968 s^-1Specific activity α:5.802376922435 × 10⁺¹⁹ Bq g^-1
1568209979.0366 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1998

Radioactive Decay

Half-life T_½ = 33(1) s respectively 3.3 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²¹⁸Po	100 %	4.859(27) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 135) and isobaric (same nucleon number A = 218) with Bismuth-218. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 135	Isobar A = 218
80	²¹⁵Hg
81	²¹⁶Tl
82	²¹⁷Pb	²¹⁸Pb
83	²¹⁸Bi	²¹⁸Bi
84	²¹⁹Po	²¹⁸Po
85	²²⁰At	²¹⁸At
86	²²¹Rn	²¹⁸Rn
87	²²²Fr	²¹⁸Fr
88	²²³Ra	²¹⁸Ra
89	²²⁴Ac	²¹⁸Ac
90	²²⁵Th	²¹⁸Th
91	²²⁶Pa	²¹⁸Pa
92	²²⁷U	²¹⁸U
93	²²⁸Np
94	²²⁹Pu
95	²³⁰Am