Tellurium-120

Properties and data of the isotope ¹²⁰Te.

Contents

General data

Name of the isotope:Tellurium-120; Te-120Symbol:¹²⁰Te or 12052TeMass number A:120 (= number of nucleons)Atomic number Z:52 (= number of protons)Neutrons N:68Isotopic mass:119.90406(2) u (atomic weight of Tellurium-120)Nuclide mass:119.8755356 u (calculated nuclear mass without electrons)Mass excess:-89.36753 MeVMass defect:1.092055952 u (per nucleus)Nuclear binding energy:1017.24356695 MeV (per nucleus)
8.47702972 MeV (average binding energy per nucleon)Separation energy:S_N = 10.258(9) MeV (first neutron)
S_P = 7.183(8) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.7038(88) femtometer fmYear of discovery:1936

Parent Nuclides

Direct parent isotope is: ¹²⁰I.

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 = 68) and isobaric (same nucleon number A = 120) with Tellurium-120. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 68	Isobar A = 120
38	¹⁰⁶Sr
39	¹⁰⁷Y
40	¹⁰⁸Zr
41	¹⁰⁹Nb
42	¹¹⁰Mo
43	¹¹¹Tc	¹²⁰Tc
44	¹¹²Ru	¹²⁰Ru
45	¹¹³Rh	¹²⁰Rh
46	¹¹⁴Pd	¹²⁰Pd
47	¹¹⁵Ag	¹²⁰Ag
48	¹¹⁶Cd	¹²⁰Cd
49	¹¹⁷In	¹²⁰In
50	¹¹⁸Sn	¹²⁰Sn
51	¹¹⁹Sb	¹²⁰Sb
52	¹²⁰Te	¹²⁰Te
53	¹²¹I	¹²⁰I
54	¹²²Xe	¹²⁰Xe
55	¹²³Cs	¹²⁰Cs
56	¹²⁴Ba	¹²⁰Ba
57	¹²⁵La	¹²⁰La
58	¹²⁶Ce	¹²⁰Ce
59	¹²⁷Pr
60	¹²⁸Nd
61	¹²⁹Pm
62	¹³⁰Sm
63	¹³¹Eu