Praseodymium (atomic symbol Pr) is element 59 on the periodic table. It is a lanthanide of low toxicity. * Atomic Weight: 140.908 * Melting Point: 1204 K (931°C or 1708°F) * Boiling Point: 3793 K (3520°C or 6368°F) * Density: 6.77 g/cc * Phase (at Room Temperature): Solid