didymium nitrate

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• neodymium — /nee oh dim ee euhm/, n. Chem. a rare earth, metallic, trivalent element occurring with cerium and other rare earth metals, and having rose colored to violet colored salts. Symbol: Nd; at. wt.: 144.24; at. no.: 60; sp. gr.: 6.9 at 20°C. [1880 85; …   Universalium

• praseodymium — /pray zee oh dim ee euhm, pray see /, n. Chem. a rare earth, metallic, trivalent element, named from its green salts. Symbol: Pr; at. wt.: 140.91; at. no.: 59; sp. gr.: 6.77 at 20°C. [1880 85; < NL, equiv. to praseo (comb. form repr. Gk prásios… …   Universalium

• Lanthanum — (pronEng|ˈlænθənəm) is a chemical element with the symbol La and atomic number 57. Characteristics Lanthanum is a silvery white metallic element that belongs to group 3 of the periodic table and is a lanthanoid. Found in some rare earth minerals …   Wikipedia

• Neodymium — praseodymium ← neodymium → promethium ↑ Nd ↓ U …   Wikipedia

• Praseodymium — (pronEng|ˌpreɪzioʊˈdɪmiəm or IPA|/ˌpreɪsioʊˈdɪmiəm/) is a chemical element that has the symbol Pr and atomic number 59. Characteristics Praseodymium is a soft silvery metal in the lanthanide group. It is somewhat more resistant to corrosion in… …   Wikipedia

• rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …   Universalium

• Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …   Wikipedia

• Praséodyme — Cérium ← Praséodyme → Néodyme …   Wikipédia en Français

• Yttrium — (pronEng|ˈɪtriəm) 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… …   Wikipedia

• Yttrium — Strontium ← Yttrium → Zirconium Sc …   Wikipédia en Français

• Welsbach, Carl Auer, Freiherr von — ▪ Austrian chemist and engineer (baron of) born Sept. 1, 1858, Vienna died Aug. 4, 1929, Treibach, Austria       Austrian chemist and engineer who invented the gas mantle, thus allowing the greatly increased output of light by gas lamps.       In …   Universalium