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
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praseodymiumrare-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
galliumrare, steel-gray, trivalent metallic element used in high-temperature thermometers because of its high boiling point (1983┬░C) and low melting point (30┬░C). Symbol: Ga; at. wt.: 69.72; at. no.: 31; sp. gr.: 5.91 at 20┬░C