Erbium-164

Properties and data of the isotope ¹⁶⁴Er.

Content

General data

Name of the isotope:Erbium-164; Er-164Symbol:¹⁶⁴Er or 16468ErMass number A:164 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:96Isotopic mass:163.92921(2) u (atomic weight of Erbium-164)Nuclide mass:163.8919099 u (calculated nuclear mass without electrons)Mass excess:-65.94046 MeVMass defect:1.434724112 u (per nucleus)Nuclear binding energy:1336.43690198 MeV (per nucleus)
8.1490055 MeV (average binding energy per nucleon)Separation energy:S_N = 8.846(5) MeV (first neutron)
S_P = 6.85352(13) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.2389(35) femtometer fmYear of discovery:1938

Parent Nuclides

Direct parent isotopes are: ¹⁶⁴Tm, ¹⁶⁴Ho.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Erbium Isotopic mixture	167.259 u	100 %
Isotope ¹⁶²Er	161.92879(2) u	0.139(5) %	stable	0+
Isotope ¹⁶⁴Er	163.92921(2) u	1.601(3) %	stable	0+
Isotope ¹⁶⁶Er	165.93030(2) u	33.503(36) %	stable	0+
Isotope ¹⁶⁷Er	166.93205(2) u	22.869(9) %	stable	7/2+
Isotope ¹⁶⁸Er	167.93238(2) u	26.978(18) %	stable	0+
Isotope ¹⁷⁰Er	169.93547(2) u	14.910(36) %	stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 96) and isobaric (same nucleon number A = 164) with Erbium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 96	Isobar A = 164
55	¹⁵¹Cs
56	¹⁵²Ba
57	¹⁵³La
58	¹⁵⁴Ce
59	¹⁵⁵Pr
60	¹⁵⁶Nd
61	¹⁵⁷Pm
62	¹⁵⁸Sm	¹⁶⁴Sm
63	¹⁵⁹Eu	¹⁶⁴Eu
64	¹⁶⁰Gd	¹⁶⁴Gd
65	¹⁶¹Tb	¹⁶⁴Tb
66	¹⁶²Dy	¹⁶⁴Dy
67	¹⁶³Ho	¹⁶⁴Ho
68	¹⁶⁴Er	¹⁶⁴Er
69	¹⁶⁵Tm	¹⁶⁴Tm
70	¹⁶⁶Yb	¹⁶⁴Yb
71	¹⁶⁷Lu	¹⁶⁴Lu
72	¹⁶⁸Hf	¹⁶⁴Hf
73	¹⁶⁹Ta	¹⁶⁴Ta
74	¹⁷⁰W	¹⁶⁴W
75	¹⁷¹Re	¹⁶⁴Re
76	¹⁷²Os	¹⁶⁴Os
77	¹⁷³Ir	¹⁶⁴Ir
78	¹⁷⁴Pt
79	¹⁷⁵Au
80	¹⁷⁶Hg
81	¹⁷⁷Tl
82	¹⁷⁸Pb