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Niobium is a chemical element; it has symbol Nb (formerly columbium, Cb) and atomic number 41. It is a light grey, crystalline, and ductile transition metal . Pure niobium has a Mohs hardness rating similar to pure titanium , [ 7 ] and it has similar ductility to iron .
Naturally occurring niobium (41 Nb) is composed of one stable isotope (93 Nb). The most stable radioisotope is 92 Nb with a half-life of 34.7 million years. The next longest-lived niobium isotopes are 94 Nb (half-life: 20,300 years) and 91 Nb with a half-life of 680 years.
[10] [11] [12] However, after the 15th Conference of the Union of Chemistry in Amsterdam in 1949, the name niobium was chosen for element 41. [13] The columbium discovered by Hatchett was probably a mixture of the new element with tantalum, which was first discovered in 1802 by Anders Gustav Ekeberg. [10] Anders Gustav Ekeberg, the discoverer ...
This is a list of chemical elements and their atomic properties, ordered by atomic number (Z).. Since valence electrons are not clearly defined for the d-block and f-block elements, there not being a clear point at which further ionisation becomes unprofitable, a purely formal definition as number of electrons in the outermost shell has been used.
For many years, there was confusion over whether columbium and tantalum were the same. In 1846, German chemist Heinrich Rose argued that there were two additional elements in tantalite, which he named niobium and pelopium for the children of the Cyclops. Eventually, Rose's niobium (atomic number 41) was found to be identical to Hatchett's ...
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This page uses the meta infobox {{Infobox isotopes (meta)}} for the element isotopes infobox.. This infobox contains the table of § Main isotopes, and the § Standard atomic weight.
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