|Isotope||Atomic mass (Da)||Isotopic abundance (amount fraction)|
Yttrium is a monoisotopic element and its atomic weight is determined solely by its isotope 89Y.
The Commission last revised the standard atomic weight of yttrium 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(Y) = 88.905 84(2) since 2013
The name derives from the Swedish village of Ytterby where the mineral gadolinite was found. In 1794,
the Finnish chemist Johan Gadolin discovered yttrium in the mineral ytterbite, which was later renamed
gadolinite for Gadolin. Gadolin originally called the element ytterbium after ytterbite. The name was
subsequently shortened to yttrium, and later another element was given the name ytterbium.