#58 CeriumCerium is a chemical element with symbol Ce and atomic number 58. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Atomic mass:140.116 amu Melting point:795.0 C (1068.15 K, 1463.0 F) Boiling point:3257.0 C (3530.15 K, 5894.6 F) Density:293 K:293 K: 6.773 g/cm3 |