Element Rhodium
It 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: |  |
| 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
| Isotope | Mass/Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| 103Rh | 102.905500 (4) | 100 | 1/2 | -0.08840 |
Radiosotope data
| Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 99Rh | 98.90820 | 16 d | EC to 99Ru | 1/2 | |
| 100Rh | 99.90812 | 20.8 h | EC to 100Ru | 1 | |
| 101Rh | 100.90616 | 3.3 y | EC to 101Ru; IT | 1/2 | |
| 102Rh | 102.906842 | 2.9 y | EC to 102Ru; β– to 102Pd | 6 | 4.04 |
| 104Rh | 103.906655 | 42.3 s | EC to 104Ru; β– to 104Pd | ||
| 105Rh | 104.905692 | 35.4 h | β– to 105Pd | 7/2 | 4.45 |