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, Kansas Radium, Kansas Radium is a city in Stafford County, Kansas, United States. As of the 2010 census, the city population was 25. A post office was opened in Radium in 1910, and remained in operation until it was discontinued in 1990. Radium is located at (38.173698, -98.894222). According to the United States Census Bureau, the city has a total area of , all of it land. As of the census of 2010, there were 25 people, 15 households, and 7 families residing in the city. The population density was . There were 19 housing units at an average density of