praseodymium (Pr) /prā′sē·ōdīm″ē·əm/ [Gk, prasaios, light-green, didymos, twin] , a rare earth metallic element. Its atomic number is 59, and its atomic mass is 140.91.
praseodymium (Pr)
praseodymium (Pr) /prā′sē·ōdīm″ē·əm/ [Gk, prasaios, light-green, didymos, twin] , a rare earth metallic element. Its atomic number is 59, and its atomic mass is 140.91.