Rhodium-100

Properties and data of the isotope ¹⁰⁰Rh.

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-100; Rh-100Symbol:¹⁰⁰Rh or 10045RhMass number A:100 (= number of nucleons)Atomic number Z:45 (= number of protons)Neutrons N:55Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.2222222222222 (= neutron-proton ratio)Neutron excess (N-Z):10Isotopic mass:99.908114(19) u (atomic weight of Rhodium-100)Nuclide mass:99.8834292 u (calculated nuclear mass without electrons)Mass excess:-85.59126 MeVMass defect:0.92058282000001 u (per nucleus)Nuclear binding energy:857.51737333 MeV (per nucleus)
8.57517373 MeV (average binding energy per nucleon)Separation energy:S_N = 8.081(19) MeV (first neutron)
S_P = 5.255(18) MeV (first proton)Half-life:20.8(1) hDecay constant λ:9.256773244657 × 10^-6 s^-1Specific activity α:5.630867917961 × 10⁺¹⁶ Bq g^-1
1521856.1940437 Ci g^-1Spin and parity:
(nuclear angular momentum)1-Quadrupole moment Q:0.153 barn (100 fm²)Year of discovery:1948

Radioactive Decay

Half-life T_½ = 20.8(1) h (hours) respectively 7.4880 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁰⁰Ru	100 %	3.636(18) MeV

Parent Nuclides

Direct parent isotope is: ¹⁰⁰Pd.

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
^100m1Rh	74.782(14) keV	214.0(20) ns	(2)+
^100m2Rh	107.60(20) MeV	4.6(2) min	(5+)
^100m3Rh	219.61(22) keV	130(10) ns	(7+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 55) and isobaric (same nucleon number A = 100) with Rhodium-100. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 55	Isobar A = 100
30	⁸⁵Zn
31	⁸⁶Ga
32	⁸⁷Ge
33	⁸⁸As
34	⁸⁹Se
35	⁹⁰Br
36	⁹¹Kr	¹⁰⁰Kr
37	⁹²Rb	¹⁰⁰Rb
38	⁹³Sr	¹⁰⁰Sr
39	⁹⁴Y	¹⁰⁰Y
40	⁹⁵Zr	¹⁰⁰Zr
41	⁹⁶Nb	¹⁰⁰Nb
42	⁹⁷Mo	¹⁰⁰Mo
43	⁹⁸Tc	¹⁰⁰Tc
44	⁹⁹Ru	¹⁰⁰Ru
45	¹⁰⁰Rh	¹⁰⁰Rh
46	¹⁰¹Pd	¹⁰⁰Pd
47	¹⁰²Ag	¹⁰⁰Ag
48	¹⁰³Cd	¹⁰⁰Cd
49	¹⁰⁴In	¹⁰⁰In
50	¹⁰⁵Sn	¹⁰⁰Sn
51	¹⁰⁶Sb
52	¹⁰⁷Te
53	¹⁰⁸I
54	¹⁰⁹Xe