Erbium-170

Properties and data of the isotope ¹⁷⁰Er.

Content

General data

Name of the isotope:Erbium-170; Er-170Symbol:¹⁷⁰Er or 17068ErMass number A:170 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:102Isotopic mass:169.93547(2) u (atomic weight of Erbium-170)Nuclide mass:169.8981699 u (calculated nuclear mass without electrons)Mass excess:-60.10931 MeVMass defect:1.480453608 u (per nucleus)Nuclear binding energy:1379.03365313 MeV (per nucleus)
8.11196267 MeV (average binding energy per nucleon)Separation energy:S_N = 7.2569(15) MeV (first neutron)
S_P = 8.60(2) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.2789(41) femtometer fmYear of discovery:1934

Parent Nuclides

Direct parent isotopes are: ¹⁷⁰Ho, ¹⁷⁰Tm.

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 = 102) and isobaric (same nucleon number A = 170) with Erbium-170. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 102	Isobar A = 170
60	¹⁶²Nd
61	¹⁶³Pm
62	¹⁶⁴Sm
63	¹⁶⁵Eu
64	¹⁶⁶Gd	¹⁷⁰Gd
65	¹⁶⁷Tb	¹⁷⁰Tb
66	¹⁶⁸Dy	¹⁷⁰Dy
67	¹⁶⁹Ho	¹⁷⁰Ho
68	¹⁷⁰Er	¹⁷⁰Er
69	¹⁷¹Tm	¹⁷⁰Tm
70	¹⁷²Yb	¹⁷⁰Yb
71	¹⁷³Lu	¹⁷⁰Lu
72	¹⁷⁴Hf	¹⁷⁰Hf
73	¹⁷⁵Ta	¹⁷⁰Ta
74	¹⁷⁶W	¹⁷⁰W
75	¹⁷⁷Re	¹⁷⁰Re
76	¹⁷⁸Os	¹⁷⁰Os
77	¹⁷⁹Ir	¹⁷⁰Ir
78	¹⁸⁰Pt	¹⁷⁰Pt
79	¹⁸¹Au	¹⁷⁰Au
80	¹⁸²Hg
81	¹⁸³Tl
82	¹⁸⁴Pb
83	¹⁸⁵Bi
84	¹⁸⁶Po