Search results
Results from the WOW.Com Content Network
Robert Wilhelm Eberhard Bunsen (German:; 30 March 1811 [a] – 16 August 1899) was a German chemist.He investigated emission spectra of heated elements, and discovered caesium (in 1860) and rubidium (in 1861) with the physicist Gustav Kirchhoff. [11]
Rubidium is a chemical element; it has symbol Rb and atomic number 37. It is a very soft, whitish-grey solid in the alkali metal group, similar to potassium and caesium. [9] Rubidium is the first alkali metal in the group to have a density higher than water.
Spectral lines of rubidium: Other properties; Natural occurrence: ... discovered by = | discovery date ref = | discovery date = | first isolation by = | first ...
Discovery of the chemical elements: Robert Bunsen discovers caesium and rubidium. German chemist Albert Niemann makes a detailed analysis of the coca leaf, isolating and purifying the alkaloid, which he calls cocaine. [6] Napoleon III, Emperor of the French, and Empress Eugénie visit Algiers and stay at the Casbah of Algiers. [7]
The oldest artifacts date from around 2000 BC. [19] ... Shortly after the discovery of rubidium, Crookes found a new green line in a selenium sample; later that year ...
The rubidium–strontium dating method (Rb–Sr) is a radiometric dating technique, used by scientists to determine the age of rocks and minerals from their content of specific isotopes of rubidium (87 Rb) and strontium (87 Sr, 86 Sr). One of the two naturally occurring isotopes of rubidium, 87 Rb, decays to 87 Sr with a half-life of 49.
This is the basis of rubidium–strontium dating. Of the unstable isotopes, the primary decay mode of the isotopes lighter than 85 Sr is electron capture or positron emission to isotopes of rubidium, and that of the isotopes heavier than 88 Sr is electron emission to isotopes of yttrium. Of special note are 89 Sr and 90 Sr.
Rubicline was first discovered in 1998 in Elba, Italy, by a team from the University of Manitoba. It was the first mineral to have been discovered with rubidium as an essential constituent. [ 5 ] It has also been found in Mozambique [ 6 ] and the Kola Peninsula in Russia . [ 7 ]