|Isotope||Atomic mass (Da)||Isotopic abundance (amount fraction)|
|93Nb ||92.906 37(2)||1|
Niobium is a monoisotopic element and its atomic weight is determined solely by its isotope 93Nb.
The Commission last revised the standard atomic weight of niobium in 2013 based on the latest Atomic Mass Evaluation by IUPAP.
SOURCE Atomic weights of the elements: Review 2000 by John R de Laeter et al. Pure Appl. Chem. 2003 (75) 683-800
© IUPAC 2003
Ar(Nb) = 92.906 37(2) since 2013
The name derives from the Greek mythological character Niobe, who was the daughter of Tantalus,
because the elements niobium and tantalum were originally thought to be identical.
Niobium was discovered in a black mineral from America called columbite by the
British chemist and manufacturer Charles Hatchett in 1801 and he called the element columbium. In
1809, the English chemist William Hyde Wollaston claimed that columbium and tantalum were identical.
Forty years later, the German chemist and pharmacist, Heinrich Rose, determined that they were
two different elements in 1846 and gave the name niobium because it was so difficult to distinguish it
from tantalum. The name columbium continued to be used in America and niobium in Europe until IUPAC
adopted the name niobium in 1949. Niobium was first isolated by the chemist C. W. Blomstrand in