Erbium-162

Properties and data of the isotope ¹⁶²Er.

Contents

See also: List of individual Erbium isotopes (and general data sources).

General data

Name of the isotope:Erbium-162; Er-162Symbol:¹⁶²Er or 16268ErMass number A:162 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:94Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3823529411765 (= neutron-proton ratio)Neutron excess (N-Z):26Isotopic mass:161.92879(2) u (atomic weight of Erbium-162)Nuclide mass:161.8914899 u (calculated nuclear mass without electrons)Mass excess:-66.33169 MeVMass defect:1.41781428 u (per nucleus)Nuclear binding energy:1320.68549493 MeV (per nucleus)
8.1523796 MeV (average binding energy per nucleon)Separation energy:S_N = 9.204(9) MeV (first neutron)
S_P = 6.4262(22) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.2246(40) femtometer fmYear of discovery:1938

Parent Nuclides

Direct parent isotope is: ¹⁶²Tm.

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 = 94) and isobaric (same nucleon number A = 162) with Erbium-162. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 94	Isobar A = 162
54	¹⁴⁸Xe
55	¹⁴⁹Cs
56	¹⁵⁰Ba
57	¹⁵¹La
58	¹⁵²Ce
59	¹⁵³Pr
60	¹⁵⁴Nd	¹⁶²Nd
61	¹⁵⁵Pm	¹⁶²Pm
62	¹⁵⁶Sm	¹⁶²Sm
63	¹⁵⁷Eu	¹⁶²Eu
64	¹⁵⁸Gd	¹⁶²Gd
65	¹⁵⁹Tb	¹⁶²Tb
66	¹⁶⁰Dy	¹⁶²Dy
67	¹⁶¹Ho	¹⁶²Ho
68	¹⁶²Er	¹⁶²Er
69	¹⁶³Tm	¹⁶²Tm
70	¹⁶⁴Yb	¹⁶²Yb
71	¹⁶⁵Lu	¹⁶²Lu
72	¹⁶⁶Hf	¹⁶²Hf
73	¹⁶⁷Ta	¹⁶²Ta
74	¹⁶⁸W	¹⁶²W
75	¹⁶⁹Re	¹⁶²Re
76	¹⁷⁰Os	¹⁶²Os
77	¹⁷¹Ir
78	¹⁷²Pt
79	¹⁷³Au
80	¹⁷⁴Hg