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Yttrium
Yttrium (pronounced /ˈɪtriəm/ IT-ree-əm) is a chemical element with symbol Y and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanoids and has historically been classified as a rare earth element. Yttrium is almost always found combined with the...
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Transition metal
The term transition metal (sometimes also called a transition element) has two possible meanings:
The name transition comes from their position in the periodic table of elements. In each of the four periods in which they occur, these elements...
Rare earth element
As defined by IUPAC, rare earth elements or rare earth metals are a collection of seventeen chemical elements in the periodic table, namely scandium, yttrium, and the fifteen lanthanides. Scandium and yttrium are considered rare earths since they...
