Erbium-174

Properties and data of the isotope ¹⁷⁴Er.

Content

General data

Name of the isotope:Erbium-174; Er-174Symbol:¹⁷⁴Er or 17468ErMass number A:174 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:106Isotopic mass:173.94423(32) u (atomic weight of Erbium-174)Nuclide mass:173.9069299 u (calculated nuclear mass without electrons)Mass excess:-51.94942 MeVMass defect:1.506353272 u (per nucleus)Nuclear binding energy:1403.15903475 MeV (per nucleus)
8.06413238 MeV (average binding energy per nucleon)Separation energy:S_N = 6.37(36) MeV (first neutron)
S_P = 9.89(42) MeV (first proton)Half-life:3.2(2) minDecay constant λ:0.0036101415654164 s^-1Specific activity α:1.25669254515 × 10⁺¹⁹ Bq g^-1
339646633.82676 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1989

Radioactive Decay

Half-life T_½ = 3.2(2) min (minutes) respectively 1.92 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁷⁴Tm	100 %	1.91(30) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 174) with Erbium-174. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 106	Isobar A = 174
64	¹⁷⁰Gd
65	¹⁷¹Tb
66	¹⁷²Dy	¹⁷⁴Dy
67	¹⁷³Ho	¹⁷⁴Ho
68	¹⁷⁴Er	¹⁷⁴Er
69	¹⁷⁵Tm	¹⁷⁴Tm
70	¹⁷⁶Yb	¹⁷⁴Yb
71	¹⁷⁷Lu	¹⁷⁴Lu
72	¹⁷⁸Hf	¹⁷⁴Hf
73	¹⁷⁹Ta	¹⁷⁴Ta
74	¹⁸⁰W	¹⁷⁴W
75	¹⁸¹Re	¹⁷⁴Re
76	¹⁸²Os	¹⁷⁴Os
77	¹⁸³Ir	¹⁷⁴Ir
78	¹⁸⁴Pt	¹⁷⁴Pt
79	¹⁸⁵Au	¹⁷⁴Au
80	¹⁸⁶Hg	¹⁷⁴Hg
81	¹⁸⁷Tl
82	¹⁸⁸Pb
83	¹⁸⁹Bi
84	¹⁹⁰Po
85	¹⁹¹At