Tellurium-126

Properties and data of the isotope ¹²⁶Te.

Content

General data

Name of the isotope:Tellurium-126; Te-126Symbol:¹²⁶Te or 12652TeMass number A:126 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:74Isotopic mass:125.90331(1) u (atomic weight of Tellurium-126)Nuclide mass:125.8747856 u (calculated nuclear mass without electrons)Mass excess:-90.06615 MeVMass defect:1.144795448 u (per nucleus)Nuclear binding energy:1066.37009104 MeV (per nucleus)
8.46325469 MeV (average binding energy per nucleon)Separation energy:S_N = 9.11369(8) MeV (first neutron)
S_P = 9.0980(21) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.7266(32) femtometer fmYear of discovery:1924

Parent Nuclides

Direct parent isotopes are: ¹²⁶I, ¹²⁶Sb.

Occurrence

Comparison of the natural Tellurium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Tellurium Isotopic mixture	127.60 u	100 %
Isotope ¹²⁰Te	119.90406(2) u	0.09(1) %	stable	0+
Isotope ¹²²Te	121.90304(1) u	2.55(12) %	stable	0+
Isotope ¹²³Te	122.90427(1) u	0.89(3) %	9.2 × 10¹⁶ a	1/2+
Isotope ¹²⁴Te	123.90282(1) u	4.74(14) %	stable	0+
Isotope ¹²⁵Te	124.9044312(15) u	7.07(15) %	stable	1/2+
Isotope ¹²⁶Te	125.90331(1) u	18.84(25) %	stable	0+
Isotope ¹²⁸Te	127.904461(6) u	31.74(8) %	7.7(4) × 10²⁴ a	0+
Isotope ¹³⁰Te	129.90622275(8) u	34.08(62) %	0.79 × 10²¹ a	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 74) and isobaric (same nucleon number A = 126) with Tellurium-126. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 74	Isobar A = 126
41	¹¹⁵Nb
42	¹¹⁶Mo
43	¹¹⁷Tc
44	¹¹⁸Ru
45	¹¹⁹Rh	¹²⁶Rh
46	¹²⁰Pd	¹²⁶Pd
47	¹²¹Ag	¹²⁶Ag
48	¹²²Cd	¹²⁶Cd
49	¹²³In	¹²⁶In
50	¹²⁴Sn	¹²⁶Sn
51	¹²⁵Sb	¹²⁶Sb
52	¹²⁶Te	¹²⁶Te
53	¹²⁷I	¹²⁶I
54	¹²⁸Xe	¹²⁶Xe
55	¹²⁹Cs	¹²⁶Cs
56	¹³⁰Ba	¹²⁶Ba
57	¹³¹La	¹²⁶La
58	¹³²Ce	¹²⁶Ce
59	¹³³Pr	¹²⁶Pr
60	¹³⁴Nd	¹²⁶Nd
61	¹³⁵Pm	¹²⁶Pm
62	¹³⁶Sm
63	¹³⁷Eu
64	¹³⁸Gd
65	¹³⁹Tb
66	¹⁴⁰Dy
67	¹⁴¹Ho