DICT.TW Dictionary Taiwan
yt·tri·um /ˈɪtriəm/
釔,稀有金屬元素,符號Y
yt·tri·um /ˈɪtrɪəm/ 名詞
yttrium
釔
Yt·tri·um n. Chem. A rare metallic element of the boron-aluminium group, found in gadolinite and other rare minerals, and extracted as a dark gray powder. Symbol Y. Atomic number 39. Atomic weight, 88.9. [Written also ittrium.]
Note: ☞ Associated with yttrium are certain rare elements, as erbium, ytterbium, samarium, etc., which are separated in a pure state with great difficulty. They are studied by means of their spark or phosphorescent spectra. Yttrium is now regarded as probably not a simple element, but as a mixture of several substances.
◄ ►
yttrium
n : a silvery metallic element that is common in rare-earth
minerals; used in magnesium and aluminum alloys [syn: Y,
atomic number 39]
yttrium
Symbol: Y
Atomic number: 39
Atomic weight: 88.905
Silvery-grey metallic element of group 3 on the periodic table. Found in
uranium ores. The only natural isotope is Y-89, there are 14 other
artificial isotopes. Chemically resembles the lanthanoids. Stable in the
air below 400 degrees, celsius. Discovered in 1828 by Friedrich Wohler.