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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]
Caesium (IUPAC spelling; [9] also spelled cesium in American English) is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F; 301.6 K), which makes it one of only five elemental metals that are liquid at or near room temperature.
Robert Bunsen (1811–1899), German chemist who discovered caesium in 1860 and rubidium in 1861, pioneer of photochemistry and organoarsenic chemistry and developer of the Bunsen burner Robert F. Christy (1916–2012), Canadian-American theoretical physicist, astrophysicist, one of the last surviving people to have worked on the Manhattan ...
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]
Crossword-like puzzles, for example Double Diamond Puzzles, appeared in the magazine St. Nicholas, published since 1873. [32] Another crossword puzzle appeared on September 14, 1890, in the Italian magazine Il Secolo Illustrato della Domenica. It was designed by Giuseppe Airoldi and titled "Per passare il tempo" ("To pass the time"). Airoldi's ...
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1913: The crossword puzzle invented by Liverpool-born Arthur Wynne (1871–1945). 1922: Discovery of Tutankhamun 's tomb by Archaeologist and Egyptologist Howard Carter , funded by Lord Carnarvon. 1933: Bayko – a plastic building model construction toy , and one of the earliest plastic toys to be marketed [ 249 ] – invented by Charles ...