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Osmium (from Ancient Greek ὀσμή (osmḗ) 'smell') is a chemical element; it has symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element.
The blue plaque for Smithson Tennant in Finkle Street, Selby, North Yorkshire. Smithson Tennant FRS (30 November 1761 [1] – 22 February 1815 [2]) was an English chemist.He is best known for his discovery of the elements iridium and osmium, which he found in the residues from the solution of platinum ores in 1803.
Osmium, 76 Os; Osmium ... History; Discovery and first isolation: Smithson Tennant (1803) Isotopes of osmium. Main isotopes [9] Decay; abundance half-life (t 1/2 ...
Perey discovered it as a decay product of 227 Ac. [177] Francium was the last element to be discovered in nature, rather than synthesized in the lab, although four of the "synthetic" elements that were discovered later (plutonium, neptunium, astatine, and promethium) were eventually found in trace amounts in nature as well. [178]
Discovery of osmium Discovery of palladium Discovery of rhodium Electrochemistry Wollaston prism Wollaston wire Wollaston landscape lens: Awards: Copley Medal (1802) Croonian Medal (1809) Royal Medal (1828) Bakerian Medal (1802, 1805, 1818, 1828) Fellow of the Royal Society (1793) Scientific career: Fields: Chemistry Physics: 22nd President of ...
Osmiridium is a naturally occurring alloy of iridium and osmium found in platinum-bearing river sands in the Ural Mountains and in North and South America. Trace amounts of osmium also exist in nickel-bearing ores found in the Sudbury, Ontario, region along with other platinum group metals. Even though the quantity of platinum metals found in ...
An image from John Dalton's A New System of Chemical Philosophy, the first modern explanation of atomic theory.. This timeline of chemistry lists important works, discoveries, ideas, inventions, and experiments that significantly changed humanity's understanding of the modern science known as chemistry, defined as the scientific study of the composition of matter and of its interactions.
Like iron but unlike osmium, ruthenium can form aqueous cations in its lower oxidation +2 and +3 states. [ 13 ] Ruthenium is the first in a downward trend in the melting and boiling points and atomization enthalpy in the 4d transition metals after the maximum seen at molybdenum , because the 4d subshell is more than half full and the electrons ...