Element Niobium

Niobium ElementNiobium, 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:Globally Harmonized System of Classification
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

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
93Nb92.9063772 (27)1009/26.1705

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
89Nb88.913491.10 hEC to 89Zr1/2
90Nb89.91126314.6 hEC to 90Zr84.961
91Nb90.906989700 yEC to 91Zr1/2
92Nb91.9071923.7 x 107 yEC to 92Zr; β to 92Mo76.114
94Nb93.90728224000 yβ to 94Mo6
95Nb94.90683434.97 dβ to 95Mo9/26.141
96Nb95.90809923.4 hβ to 96Mo64.976
97Nb96.9080961.23 hβ to 97Mo9/26.15

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