praseodymium
/prey-zee-oh-dim-ee-uhm, prey-see-/US // ˌpreɪ zi oʊˈdɪm i əm, ˌpreɪ si- //UK // (ˌpreɪzɪəʊˈdɪmɪəm) //
镨钕,镨钕合金,镨钕相间,镨钕的
Definitions
n.名词 noun
- 1
Chemistry.
- : a rare-earth, metallic, trivalent element, named from its green salts. Symbol: Pr; atomic weight: 140.91; atomic number: 59; specific gravity: 6.77 at 20°C.
Examples
The salts of praseodymium are green in colour, and give a characteristic spark spectrum.
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