pra·seo·dym·i·um /ˌprezioˈdɪmiəm, ˌpresi-/
pra·seo·dym·i·um /ˌprezɪoˈdɪmɪəm, ˌpresɪ-/ 名詞
Pra·se·o·dym·i·um n. Chem. An elementary substance, one of the constituents of didymium; -- so called from the green color of its salts. Symbol Ps. Atomic weight 143.6.
n : a soft yellowish-white trivalent metallic element of the
rare earth group; can be recovered from bastnasite or
monazite by an ion-exchange process [syn: Pr, atomic
Atomic number: 59
Atomic weight: 140.907
Soft silvery metallic element, belongs to the lanthanoids. Only natural
isotope is Pr-141 which is not radioactive. Fourteen radioactive isotopes
have been artificially produced. Used in rare-earth alloys. Discovered in
1885 by C.A. von Welsbach.