Hafnium-176

Properties and data of the isotope ¹⁷⁶Hf.

Content

General data

Name of the isotope:Hafnium-176; Hf-176Symbol:¹⁷⁶Hf or 17672HfMass number A:176 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:104Isotopic mass:175.94141(2) u (atomic weight of Hafnium-176)Nuclide mass:175.901916 u (calculated nuclear mass without electrons)Mass excess:-54.57623 MeVMass defect:1.523143568 u (per nucleus)Nuclear binding energy:1418.79909473 MeV (per nucleus)
8.06135849 MeV (average binding energy per nucleon)Separation energy:S_N = 8.1660(18) MeV (first neutron)
S_P = 6.6997(9) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.3286(32) femtometer fmYear of discovery:1934

Parent Nuclides

Direct parent isotopes are: ¹⁷⁶Ta, ¹⁷⁶Lu.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Hafnium Isotopic mixture	178.486 u	100 %
Isotope ¹⁷⁴Hf	173.94005(2) u	0.16(12) %	2.0(4) × 10¹⁵ a	0+
Isotope ¹⁷⁶Hf	175.94141(2) u	5.26(70) %	stable	0+
Isotope ¹⁷⁷Hf	176.94323(2) u	18.60(16) %	stable	7/2-
Isotope ¹⁷⁸Hf	177.94371(2) u	27.28(28) %	stable	0+
Isotope ¹⁷⁹Hf	178.94582(2) u	13.62(11) %	stable	9/2+
Isotope ¹⁸⁰Hf	179.94656(2) u	35.08(33) %	stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 104) and isobaric (same nucleon number A = 176) with Hafnium-176. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 104	Isobar A = 176
62	¹⁶⁶Sm
63	¹⁶⁷Eu
64	¹⁶⁸Gd
65	¹⁶⁹Tb
66	¹⁷⁰Dy
67	¹⁷¹Ho
68	¹⁷²Er	¹⁷⁶Er
69	¹⁷³Tm	¹⁷⁶Tm
70	¹⁷⁴Yb	¹⁷⁶Yb
71	¹⁷⁵Lu	¹⁷⁶Lu
72	¹⁷⁶Hf	¹⁷⁶Hf
73	¹⁷⁷Ta	¹⁷⁶Ta
74	¹⁷⁸W	¹⁷⁶W
75	¹⁷⁹Re	¹⁷⁶Re
76	¹⁸⁰Os	¹⁷⁶Os
77	¹⁸¹Ir	¹⁷⁶Ir
78	¹⁸²Pt	¹⁷⁶Pt
79	¹⁸³Au	¹⁷⁶Au
80	¹⁸⁴Hg	¹⁷⁶Hg
81	¹⁸⁵Tl	¹⁷⁶Tl
82	¹⁸⁶Pb
83	¹⁸⁷Bi
84	¹⁸⁸Po