Element Niobium
Niobium, formerly known as columbium, is a chemical element with the symbol Nb (formerly Cb) and atomic number 41. Niobium is a light grey, crystalline, and ductile transition metal.
Niobium is often found in the minerals pyrochlore and columbite, hence the former name “columbium”.
Niobium has been used in trials studying the treatment of Obesity and Overweight.
Names and Identifiers
| Chemical Formula: | Nb |
| CAS: | 7440-03-1 |
| Molecular Weight: | 92.90640g/mol |
| EC Number : | 231-113-5 |
| MDL Number: | MFCD00011126 |
| Color: | silvery-white/ gray metalli |
| Other Names: | Niob, Niobio, Nióbio, Niobio |
| PubChem CID: | 23936 |
| IUPAC Name: | Niobium |
| Inchl: | InChI=1S/Nb |
| InChI Key: | GUCVJGMIXFAOAE-UHFFFAOYSA-N |
| Canonical SMILES: | [Nb] |
| ICSC Number: | n/a |
Physical & Chemical Properties
| Phase: | Solid |
| Density: | 8.57 g/cm³ |
| Boiling Point: | 5017 K (4744 °C, 8571 °F) |
| Melting Point: | 2750 K (2477 °C, 4491 °F) |
| Molecular Formula: | Nb |
| Flash Point: | n/a |
| Exact Mass: | 92.90640 |
| Symbol: |  |
| Signal Word: | Danger |
| Hazard Statements: | H250 |
| Precautionary Statements: | P210-P222-P231-P280-P422 |
| Hazard Codes: | F: Flammable; |
| Risk Phrases: | R17 |
| Safety Phrases: | S17-S36-S26 |
| RIDADR: | UN 1383 4.2/PG 1 |
| WGK Germany: | n/a |
| RTECS: | QT9900000 |
| Packaging Group: | II |
| Hazard Class: | 8 |
Niobium in the Earth’s crust comprises one stable isotope, 93Nb.
By 2003, at least 32 radioisotopes had been synthesized, ranging in atomic mass from 81 to 113.
Naturally occurring isotopes
| Isotope | Mass/Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| 93Nb | 92.9063772 (27) | 100 | 9/2 | 6.1705 |
Radiosotope data
| Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 89Nb | 88.91349 | 1.10 h | EC to 89Zr | 1/2 | |
| 90Nb | 89.911263 | 14.6 h | EC to 90Zr | 8 | 4.961 |
| 91Nb | 90.906989 | 700 y | EC to 91Zr | 1/2 | |
| 92Nb | 91.907192 | 3.7 x 107 y | EC to 92Zr; β– to 92Mo | 7 | 6.114 |
| 94Nb | 93.907282 | 24000 y | β– to 94Mo | 6 | |
| 95Nb | 94.906834 | 34.97 d | β– to 95Mo | 9/2 | 6.141 |
| 96Nb | 95.908099 | 23.4 h | β– to 96Mo | 6 | 4.976 |
| 97Nb | 96.908096 | 1.23 h | β– to 97Mo | 9/2 | 6.15 |