Search results
Results from the WOW.Com Content Network
The dates indicate the true age of the minerals only if the rocks have not been subsequently altered (see rubidium–strontium dating). [ 28 ] [ 29 ] Rubidium-82 , one of the element's non-natural isotopes, is produced by electron-capture decay of strontium-82 with a half-life of 25.36 days.
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]
Discovery of the underlying order in metallic glasses, which may hold the key to the ability to create new high-tech alloys with specific properties. Discovery of new ways of using a well-known polymer in organic light emitting diodes ( OLEDs ), which could eliminate the need for an increasingly problematic and breakable metal-oxide used in ...
Atomic number (Z): 49: Group: group 13 (boron group) Period: period 5: Block p-block Electron configuration [] 4d 10 5s 2 5pElectrons per shell: 2, 8, 18, 18, 3: Physical properties
Prepared and isolated from urine, it was the first element whose discovery date and discoverer are recorded. [53] Its name first appears in print in the work of Georg Kaspar Kirchmayer in 1676. Recognised as an element by Lavoisier. [1] 1 Hydrogen: 1671 R. Boyle: 1671 R. Boyle Robert Boyle produced it by reacting iron filings with dilute acid.
Christopher Columbus [b] (/ k ə ˈ l ʌ m b ə s /; [2] between 25 August and 31 October 1451 – 20 May 1506) was an Italian [3] [c] explorer and navigator from the Republic of Genoa [3] [4] who completed four Spanish-based voyages across the Atlantic Ocean sponsored by the Catholic Monarchs, opening the way for the widespread European exploration and colonization of the Americas.
In May 1792, American merchant sea captain Robert Gray sailed into the Columbia River, becoming the first recorded American to navigate into it.The voyage, conducted on the privately owned Columbia Rediviva, was eventually used as a basis for the United States' claim on the Pacific Northwest, although its relevance to the claim was disputed by the British.
Since the discovery of the New World, various authors have tried to link the Brendan legend with an early discovery of America. In 1977, the voyage was successfully recreated by Tim Severin using a replica of an ancient Irish currach. [146] According to a British myth, Madoc was a prince from Wales who explored the Americas as early as 1170 ...