Tellurium-122

Properties and data of the isotope ¹²²Te.

Content

General data

Name of the isotope:Tellurium-122; Te-122Symbol:¹²²Te or 12252TeMass number A:122 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:70Isotopic mass:121.90304(1) u (atomic weight of Tellurium-122)Nuclide mass:121.8745156 u (calculated nuclear mass without electrons)Mass excess:-90.31766 MeVMass defect:1.110405784 u (per nucleus)Nuclear binding energy:1034.33632536 MeV (per nucleus)
8.4781666 MeV (average binding energy per nucleon)Separation energy:S_N = 9.840(26) MeV (first neutron)
S_P = 8.0031(21) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.7095(31) femtometer fmYear of discovery:1932

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 = 70) and isobaric (same nucleon number A = 122) with Tellurium-122. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 70	Isobar A = 122
39	¹⁰⁹Y
40	¹¹⁰Zr
41	¹¹¹Nb
42	¹¹²Mo
43	¹¹³Tc
44	¹¹⁴Ru	¹²²Ru
45	¹¹⁵Rh	¹²²Rh
46	¹¹⁶Pd	¹²²Pd
47	¹¹⁷Ag	¹²²Ag
48	¹¹⁸Cd	¹²²Cd
49	¹¹⁹In	¹²²In
50	¹²⁰Sn	¹²²Sn
51	¹²¹Sb	¹²²Sb
52	¹²²Te	¹²²Te
53	¹²³I	¹²²I
54	¹²⁴Xe	¹²²Xe
55	¹²⁵Cs	¹²²Cs
56	¹²⁶Ba	¹²²Ba
57	¹²⁷La	¹²²La
58	¹²⁸Ce	¹²²Ce
59	¹²⁹Pr	¹²²Pr
60	¹³⁰Nd
61	¹³¹Pm
62	¹³²Sm
63	¹³³Eu
64	¹³⁴Gd
65	¹³⁵Tb