Element Rhodium

Rhodium ElementIt is a chemical element with the symbol Rh and atomic number 45. It is a rare, silvery-white, hard, corrosion-resistant, and chemically inert transition metal. It is a noble metal and a member of the platinum group.
Rhodium detectors are used in nuclear reactors to measure the neutron flux level. Other uses of Element Rhodium include asymmetric hydrogenation used to form drug precursors and the processes for the production of Roundup and acetic acid.

Names and Identifiers

Chemical Formula:Rh
CAS:7440-16-6
Molecular Weight:102.906g/mol
EC Number :231-125-0
MDL Number:MFCD00011201
Color:silvery white metallic/ silvery-white
Other Names:Rodio, Ródio
PubChem CID:23948
IUPAC Name:Rhodium
Inchl:InChI=1S/Rh
InChI Key:MHOVAHRLVXNVSD-UHFFFAOYSA-N
Canonical SMILES:[Rh]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:12.41g/cm³
Boiling Point:3968 K ​(3695 °C, ​6683 °F)
Melting Point:2237 K ​(1964 °C, ​3567 °F)
Molecular Formula:Rh
Flash Point:n/a
Exact Mass:102.905502
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H413
Precautionary Statements:P210
Hazard Codes:F:Flammable;Xi:Irritant;
Risk Phrases:R11
Safety Phrases:S26-S24/25-S16-S22-S36-S17-S45-S36/37/39
RIDADR:UN 3089 4.1/PG 2
WGK Germany:3
RTECS:VI9069000
Packaging Group:III
Hazard Class:4.1

Naturally occurring rhodium is composed of only one isotope, 103Rh.
The most stable radioisotopes are 101Rh with a half-life of 3.3 years, 102Rh with a half-life of 207 days, 102mRh with a half-life of 2.9 years, and 99Rh with a half-life of 16.1 days.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
103Rh102.905500 (4)1001/2-0.08840

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
99Rh98.9082016 dEC to 99Ru1/2
100Rh99.9081220.8 hEC to 100Ru1
101Rh100.906163.3 yEC to 101Ru; IT1/2
102Rh102.9068422.9 yEC to 102Ru; β to 102Pd64.04
104Rh103.90665542.3 sEC to 104Ru; β to 104Pd
105Rh104.90569235.4 hβ to 105Pd7/24.45

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