Indium-100

Properties and data of the isotope ¹⁰⁰In.

Content

General data

Name of the isotope:Indium-100; In-100Symbol:¹⁰⁰In or 10049InMass number A:100 (= number of nucleons)Atomic number Z:49 (= number of protons)Neutrons N:51Isotopic mass:99.93096(20) u (atomic weight of Indium-100)Nuclide mass:99.9040811 u (calculated nuclear mass without electrons)Mass excess:-64.31035 MeVMass defect:0.894377284 u (per nucleus)Nuclear binding energy:833.10707378 MeV (per nucleus)
8.33107074 MeV (average binding energy per nucleon)Separation energy:S_N = 11.01(35) MeV (first neutron)
S_P = 1.67(18) MeV (first proton)Half-life:5.8(2) sDecay constant λ:0.1195081345793 s^-1Specific activity α:7.269644649947 × 10⁺²⁰ Bq g^-1
19647688243.102 Ci g^-1Spin and parity:
(nuclear angular momentum)(6+)Year of discovery:1982

Radioactive Decay

Half-life T_½ = 5.8(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁰⁰Cd	98.3 %	9.88(18) MeV
ε, p	⁹⁹Ag	1.7(4) %

Parent Nuclides

Direct parent isotope is: ¹⁰⁰Sn.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 51) and isobaric (same nucleon number A = 100) with Indium-100. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 51	Isobar A = 100
28	⁷⁹Ni
29	⁸⁰Cu
30	⁸¹Zn
31	⁸²Ga
32	⁸³Ge
33	⁸⁴As
34	⁸⁵Se
35	⁸⁶Br
36	⁸⁷Kr	¹⁰⁰Kr
37	⁸⁸Rb	¹⁰⁰Rb
38	⁸⁹Sr	¹⁰⁰Sr
39	⁹⁰Y	¹⁰⁰Y
40	⁹¹Zr	¹⁰⁰Zr
41	⁹²Nb	¹⁰⁰Nb
42	⁹³Mo	¹⁰⁰Mo
43	⁹⁴Tc	¹⁰⁰Tc
44	⁹⁵Ru	¹⁰⁰Ru
45	⁹⁶Rh	¹⁰⁰Rh
46	⁹⁷Pd	¹⁰⁰Pd
47	⁹⁸Ag	¹⁰⁰Ag
48	⁹⁹Cd	¹⁰⁰Cd
49	¹⁰⁰In	¹⁰⁰In
50	¹⁰¹Sn	¹⁰⁰Sn