Bismuth-210

Properties and data of the isotope ²¹⁰Bi.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Bismuth isotopes (and general data sources).

General data

Name of the isotope:Bismuth-210; Bi-210Other names:Radium ESymbol:²¹⁰Bi or 21083BiMass number A:210 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:127Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.5301204819277 (= neutron-proton ratio)Neutron excess (N-Z):44Isotopic mass:209.9841202(15) u (atomic weight of Bismuth-210)Nuclide mass:209.9385933 u (calculated nuclear mass without electrons)Mass excess:-14.79194 MeVMass defect:1.765801788 u (per nucleus)Nuclear binding energy:1644.83377071 MeV (per nucleus)
7.83254177 MeV (average binding energy per nucleon)Separation energy:S_N = 4.60463(8) MeV (first neutron)
S_P = 4.4663(11) MeV (first proton)Half-life:5.012(5) dDecay constant λ:1.600665764572 × 10^-6 s^-1Specific activity α:4.612169714800 × 10⁺¹⁵ Bq g^-1
124653.23553515 Ci g^-1Spin and parity:
(nuclear angular momentum)1-Magnetic dipole moment:μ(μ_N) = - 0.04451(6)Quadrupole moment Q:0.13.6(1) barn (100 fm²)Nuclear g-factor:g_l = -0.04451Charge radius:5.5300(903) femtometer fmYear of discovery:1905

Radioactive Decay

Half-life T_½ = 5.012(5) d respectively 4.330368 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²¹⁰Po	100 %	1.1612(8) MeV
α	²⁰⁶Tl	trace	5.0365(8) MeV

Parent Nuclides

Direct parent isotopes are: ²¹⁴At, ²¹⁰Pb.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^210mBi	271.31(11) keV	3.04(6) × 10⁶ a	9-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 127) and isobaric (same nucleon number A = 210) with Bismuth-210. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 127	Isobar A = 210
76	²⁰³Os
77	²⁰⁴Ir
78	²⁰⁵Pt
79	²⁰⁶Au	²¹⁰Au
80	²⁰⁷Hg	²¹⁰Hg
81	²⁰⁸Tl	²¹⁰Tl
82	²⁰⁹Pb	²¹⁰Pb
83	²¹⁰Bi	²¹⁰Bi
84	²¹¹Po	²¹⁰Po
85	²¹²At	²¹⁰At
86	²¹³Rn	²¹⁰Rn
87	²¹⁴Fr	²¹⁰Fr
88	²¹⁵Ra	²¹⁰Ra
89	²¹⁶Ac	²¹⁰Ac
90	²¹⁷Th	²¹⁰Th
91	²¹⁸Pa	²¹⁰Pa
92	²¹⁹U
93	²²⁰Np