praseodymium 的定义
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.
更多praseodymium例句
- The salts of praseodymium are green in colour, and give a characteristic spark spectrum.