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yttrium yttrium
yttrium [for Ytterby, a town in Sweden], metallic chemical element; symbol Y; at. no. 39; at. wt. 88.9059; m.p. about 1,522°C; b.p. 3,338°C; sp. gr. about 4.45; valence +3. Yttrium is a highly crystalline iron-gray metal. Usually considered a rare-earth metal , it is found above lanthanum... Read more
monazite monazite
monazite , yellow to reddish-brown natural phosphate of the rare earths , mainly the cerium and lanthanum metals, usually with some thorium . Yttrium, calcium, iron, and silica are frequently present. Monazite sand is the crude natural material and is usually purified from other minerals... Read more
rare-earth metals rare-earth metals
rare-earth metals in chemistry, group of metals including those of the lanthanide series and actinide series , usually yttrium , sometimes scandium and thorium , and rarely zirconium . Promethium, which is not found in nature, is not usually considered a rare-earth metal. The metals usually... Read more
Y Y
Y 25th letter of the alphabet . It was a Latin importation of the eastern Greek upsilon (see U ), which was pronounced like ü; the Romans used it for Greek words. In English y mainly represents the semivowel occurring in words such as yet; the same semivowel is the second member of the... Read more
Periodic Table of the Elements Yttrium Periodic Table of the Elements Yttrium
Periodic Table of the Elements: Yttrium Periodic Table of the Elements: Yttrium Atomic Number: 39 Atomic Symbol: Y Yttrium Atomic Weight: 88.9059 Electron Configuration: 2 · 8 · 18 9 · 2... Read more
rare earths rare earths
rare earths in chemistry, oxides of the rare-earth metals . They were once thought to be elements themselves. They are widely distributed in the earth's crust and are fairly abundant, although they were once thought to be very scarce. Generally, the name of an earth is formed from the name of its... Read more
terbium terbium
terbium [from Ytterby, a village in Sweden], metallic chemical element; symbol Tb; at. no. 65; at. wt. 158.9254; m.p. 1,356°C; b.p. 3,123°C; sp. gr. about 8.25; valence +3 or +4. Terbium is a soft, malleable, ductile, silver-gray metal. It is one of the rare-earth metals of the ... Read more
lutetium lutetium
lutetium formerly lutecium , metallic chemical element; symbol Lu; atomic number 71; at. wt. 174.967; m.p. about 1,663°C; b.p. about 3,395°C; sp. gr. 9.835 at 25°C; valence +3. Lutetium is a silver-white metal that is relatively stable in air. One of the rare-earth metals , it is... Read more
ton ton
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thulium thulium
thulium [from Thule, an ancient name for Scandinavia], metallic chemical element; symbol Tm; at. no. 69; at. wt. 168.9342; m.p. about 1,545°C; b.p. 1,947°C; sp. gr. 9.3; valence +3. Thulium is a soft, malleable, ductile, lustrous silver-white metal. It is one of the rare-earth metals of... Read more

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