Germanium-74

Properties and data of the isotope ⁷⁴Ge.

Contents

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

General data

Name of the isotope:Germanium-74; Ge-74Symbol:⁷⁴Ge or 7432GeMass number A:74 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:42Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3125 (= neutron-proton ratio)Neutron excess (N-Z):10Isotopic mass:73.92117776(9) u (atomic weight of Germanium-74)Nuclide mass:73.9036238 u (calculated nuclear mass without electrons)Mass excess:-73.42244 MeVMass defect:0.693149736 u (per nucleus)Nuclear binding energy:645.66482019 MeV (per nucleus)
8.72520027 MeV (average binding energy per nucleon)Separation energy:S_N = 10.19624(6) MeV (first neutron)
S_P = 11.0121(17) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.0742(11) femtometer fmYear of discovery:1923

Parent Nuclides

Direct parent isotopes are: ⁷⁴As, ⁷⁴Ga.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Germanium Isotopic mixture	72.630 u	100 %
Isotope ⁷⁰Ge	69.924249(6) u	20.52(19) %	stable	0+
Isotope ⁷²Ge	71.9220758(5) u	27.45(15) %	stable	0+
Isotope ⁷³Ge	72.9234590(4) u	7.76(8) %	stable	9/2+
Isotope ⁷⁴Ge	73.92117776(9) u	36.52(12) %	stable	0+
Isotope ⁷⁶Ge	75.9214027(2) u	7.75(12) %	1.926(94) × 10²¹ a	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 42) and isobaric (same nucleon number A = 74) with Germanium-74. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 42	Isobar A = 74
21	⁶³Sc
22	⁶⁴Ti
23	⁶⁵V
24	⁶⁶Cr
25	⁶⁷Mn
26	⁶⁸Fe	⁷⁴Fe
27	⁶⁹Co	⁷⁴Co
28	⁷⁰Ni	⁷⁴Ni
29	⁷¹Cu	⁷⁴Cu
30	⁷²Zn	⁷⁴Zn
31	⁷³Ga	⁷⁴Ga
32	⁷⁴Ge	⁷⁴Ge
33	⁷⁵As	⁷⁴As
34	⁷⁶Se	⁷⁴Se
35	⁷⁷Br	⁷⁴Br
36	⁷⁸Kr	⁷⁴Kr
37	⁷⁹Rb	⁷⁴Rb
38	⁸⁰Sr	⁷⁴Sr
39	⁸¹Y
40	⁸²Zr
41	⁸³Nb
42	⁸⁴Mo
43	⁸⁵Tc
44	⁸⁶Ru