Rhodium-112

Properties and data of the isotope ¹¹²Rh.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Rhodium-112; Rh-112Symbol:¹¹²Rh or 11245RhMass number A:112 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:67Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4888888888889 (= neutron-proton ratio)Neutron excess (N-Z):22Excitation energy:+ XIsotopic mass:111.91440(5) u (atomic weight of Rhodium-112)Nuclide mass:111.8897152 u (calculated nuclear mass without electrons)Mass excess:-79.73589 MeVMass defect:1.018275812 u (per nucleus)Nuclear binding energy:948.51780922 MeV (per nucleus)
8.46890901 MeV (average binding energy per nucleon)Separation energy:S_N = 5.50(4) MeV (first neutron)
S_P = 10.24(5) MeV (first proton)Half-life:3.6(3) sDecay constant λ:0.19254088348887 s^-1Specific activity α:1.044602091591 × 10⁺²¹ Bq g^-1
28232488961.935 Ci g^-1Spin and parity:
(nuclear angular momentum)(1+)Year of discovery:1972

Radioactive Decay

Half-life T_½ = 3.6(3) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹¹²Pd	100 %	6.59(4) MeV

Parent Nuclides

Direct parent isotope is: ¹¹²Ru.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^112mRh	+y keV	6.76(12) s	(6+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 67) and isobaric (same nucleon number A = 112) with Rhodium-112. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 67	Isobar A = 112
38	¹⁰⁵Sr
39	¹⁰⁶Y
40	¹⁰⁷Zr	¹¹²Zr
41	¹⁰⁸Nb	¹¹²Nb
42	¹⁰⁹Mo	¹¹²Mo
43	¹¹⁰Tc	¹¹²Tc
44	¹¹¹Ru	¹¹²Ru
45	¹¹²Rh	¹¹²Rh
46	¹¹³Pd	¹¹²Pd
47	¹¹⁴Ag	¹¹²Ag
48	¹¹⁵Cd	¹¹²Cd
49	¹¹⁶In	¹¹²In
50	¹¹⁷Sn	¹¹²Sn
51	¹¹⁸Sb	¹¹²Sb
52	¹¹⁹Te	¹¹²Te
53	¹²⁰I	¹¹²I
54	¹²¹Xe	¹¹²Xe
55	¹²²Cs	¹¹²Cs
56	¹²³Ba
57	¹²⁴La
58	¹²⁵Ce
59	¹²⁶Pr
60	¹²⁷Nd
61	¹²⁸Pm
62	¹²⁹Sm
63	¹³⁰Eu