Radium seventh of a gram of radium. One kilogram of the Earth's crust contains about 900 picograms of radium, and one liter of sea water contains about 89 femtograms of radium. Radium was discovered by Marie Sklodowska-Curie and her husband Pierre Curie on 21 December 1898, in a uraninite (pitchblende) sample. While studying the mineral earlier, the Curies removed uranium from it and found that the remaining material was still radioactive. They separated out an element similar to bismuth from pitchblende in July 1898, that turned out to be polonium. They then separated out a radioactive mixture consisting mostly of two
Radium, Colorado Radium, Colorado Radium is a small rural unincorporated community in southwestern Grand County, Colorado, United States. The community sits in the mountains along an isolated stretch of Colorado River downstream from Gore Canyon and southwest of Kremmling. The mainline of the Denver and Rio Grande Western Railroad (now the Union Pacific Railroad) runs past the community, which is accessible by dirt and gravel roads only. The community of Radium consists of a cluster of houses on the north side of a bridge on the Colorado. The primary local industry is livestock ranching. The community is named for the element radium,