Germanium-70

Properties and data of the isotope ⁷⁰Ge.

Contents

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

General data

Name of the isotope:Germanium-70; Ge-70Symbol:⁷⁰Ge or 7032GeMass number A:70 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:38Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.1875 (= neutron-proton ratio)Neutron excess (N-Z):6Isotopic mass:69.924249(6) u (atomic weight of Germanium-70)Nuclide mass:69.906695 u (calculated nuclear mass without electrons)Mass excess:-70.5616 MeVMass defect:0.655418832 u (per nucleus)Nuclear binding energy:610.5187095 MeV (per nucleus)
8.72169585 MeV (average binding energy per nucleon)Separation energy:S_N = 11.5325(16) MeV (first neutron)
S_P = 8.5230(15) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.0414(11) femtometer fmYear of discovery:1923

Parent Nuclides

Direct parent isotopes are: ⁷⁰As, ⁷⁰Ga.

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 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+
Isotope ⁷³Ge	72.92345895(6) u	7.76(8) %	stable	9/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 38) and isobaric (same nucleon number A = 70) with Germanium-70. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 38	Isobar A = 70
19	⁵⁷K
20	⁵⁸Ca
21	⁵⁹Sc
22	⁶⁰Ti
23	⁶¹V
24	⁶²Cr
25	⁶³Mn	⁷⁰Mn
26	⁶⁴Fe	⁷⁰Fe
27	⁶⁵Co	⁷⁰Co
28	⁶⁶Ni	⁷⁰Ni
29	⁶⁷Cu	⁷⁰Cu
30	⁶⁸Zn	⁷⁰Zn
31	⁶⁹Ga	⁷⁰Ga
32	⁷⁰Ge	⁷⁰Ge
33	⁷¹As	⁷⁰As
34	⁷²Se	⁷⁰Se
35	⁷³Br	⁷⁰Br
36	⁷⁴Kr	⁷⁰Kr
37	⁷⁵Rb
38	⁷⁶Sr
39	⁷⁷Y
40	⁷⁸Zr