Tin-122

Properties and data of the isotope ¹²²Sn.

Contents

General data

Name of the isotope:Tin-122; Sn-122Symbol:¹²²Sn or 12250SnMass number A:122 (= number of nucleons)Atomic number Z:50 (= number of protons)Neutrons N:72Isotopic mass:121.90344(2) u (atomic weight of Tin-122)Nuclide mass:121.8760126 u (calculated nuclear mass without electrons)Mass excess:-89.94506 MeVMass defect:1.111685552 u (per nucleus)Nuclear binding energy:1035.52842157 MeV (per nucleus)
8.48793788 MeV (average binding energy per nucleon)Separation energy:S_N = 8.8154(23) MeV (first neutron)
S_P = 11.394(27) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.6634(22) femtometer fmYear of discovery:1928

Parent Nuclides

Direct parent isotopes are: ¹²²Sb, ¹²²In.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Tin Isotopic mixture	118.710 u	100 %
Isotope ¹¹²Sn	111.904824(4) u	0.97(1) %	stable	0+
Isotope ¹¹⁴Sn	113.902783(6) u	0.66(1) %	stable	0+
Isotope ¹¹⁵Sn	114.9033447(1) u	0.34(1) %	stable	1/2+
Isotope ¹¹⁶Sn	115.901743(1) u	14.54(9) %	stable	0+
Isotope ¹¹⁷Sn	116.902954(3) u	7.68(7) %	stable	1/2+
Isotope ¹¹⁸Sn	117.901607(3) u	24.22(9) %	stable	0+
Isotope ¹¹⁹Sn	118.903311(5) u	8.59(4) %	stable	1/2+
Isotope ¹²⁰Sn	119.902202(6) u	32.58(9) %	stable	0+
Isotope ¹²²Sn	121.90344(2) u	4.63(3) %	stable	0+
Isotope ¹²⁴Sn	123.905277(7) u	5.79(5) %	stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 72) and isobaric (same nucleon number A = 122) with Tin-122. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 72	Isobar A = 122
40	¹¹²Zr
41	¹¹³Nb
42	¹¹⁴Mo
43	¹¹⁵Tc
44	¹¹⁶Ru	¹²²Ru
45	¹¹⁷Rh	¹²²Rh
46	¹¹⁸Pd	¹²²Pd
47	¹¹⁹Ag	¹²²Ag
48	¹²⁰Cd	¹²²Cd
49	¹²¹In	¹²²In
50	¹²²Sn	¹²²Sn
51	¹²³Sb	¹²²Sb
52	¹²⁴Te	¹²²Te
53	¹²⁵I	¹²²I
54	¹²⁶Xe	¹²²Xe
55	¹²⁷Cs	¹²²Cs
56	¹²⁸Ba	¹²²Ba
57	¹²⁹La	¹²²La
58	¹³⁰Ce	¹²²Ce
59	¹³¹Pr	¹²²Pr
60	¹³²Nd
61	¹³³Pm
62	¹³⁴Sm
63	¹³⁵Eu
64	¹³⁶Gd
65	¹³⁷Tb
66	¹³⁸Dy