Technetium-100

Properties and data of the isotope ¹⁰⁰Tc.

Contents

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

General data

Name of the isotope:Technetium-100; Tc-100Symbol:¹⁰⁰Tc or 10043TcMass number A:100 (= number of nucleons)Atomic number Z:43 (= number of protons)Neutrons N:57Isotopic mass:99.9076527(14) u (atomic weight of Technetium-100)Nuclide mass:99.8840649 u (calculated nuclear mass without electrons)Mass excess:-86.02096 MeVMass defect:0.92272388800001 u (per nucleus)Nuclear binding energy:859.51176533 MeV (per nucleus)
8.59511765 MeV (average binding energy per nucleon)Separation energy:S_N = 6.7644(10) MeV (first neutron)
S_P = 7.3398(13) MeV (first proton)Half-life:15.46(19) sDecay constant λ:0.044834875844757 s^-1Specific activity α:2.727292300756 × 10⁺²⁰ Bq g^-1
7371060272.3151 Ci g^-1Spin and parity:
(nuclear angular momentum)1+Year of discovery:1952

Radioactive Decay

Half-life T_½ = 15.46(19) s respectively 1.546 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰⁰Ru	99.9982(9) %	3.2064(14) MeV
EC	¹⁰⁰Mo	0.0018(9) %	0.1721(14) MeV

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
^100m1Tc	200.67(4) keV	8.32(14) μs	(4)+
^100m2Tc	243.95(4) keV	3.2(2) μs	(6)+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 57) and isobaric (same nucleon number A = 100) with Technetium-100. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 57	Isobar A = 100
32	⁸⁹Ge
33	⁹⁰As
34	⁹¹Se
35	⁹²Br
36	⁹³Kr	¹⁰⁰Kr
37	⁹⁴Rb	¹⁰⁰Rb
38	⁹⁵Sr	¹⁰⁰Sr
39	⁹⁶Y	¹⁰⁰Y
40	⁹⁷Zr	¹⁰⁰Zr
41	⁹⁸Nb	¹⁰⁰Nb
42	⁹⁹Mo	¹⁰⁰Mo
43	¹⁰⁰Tc	¹⁰⁰Tc
44	¹⁰¹Ru	¹⁰⁰Ru
45	¹⁰²Rh	¹⁰⁰Rh
46	¹⁰³Pd	¹⁰⁰Pd
47	¹⁰⁴Ag	¹⁰⁰Ag
48	¹⁰⁵Cd	¹⁰⁰Cd
49	¹⁰⁶In	¹⁰⁰In
50	¹⁰⁷Sn	¹⁰⁰Sn
51	¹⁰⁸Sb
52	¹⁰⁹Te
53	¹¹⁰I
54	¹¹¹Xe
55	¹¹²Cs