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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]
Margaret was an only child, born in Berkeley, California to mother Margaret Orchard and father John Melhase, who worked as a geologist. [1] During her time at UC Berkeley, Melhase was a member of the Berkeley Folk Dancers and edited the group's newsletter.
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.
Whether you're an Earth Day expert or hoping to learn more about our beautiful blue planet, these trivia questions will help you brush up on your planetary proficiency. Earth Day Quiz Questions
[3] [7] Francium is the second rarest element (after astatine) — only about 550g exists in the entire Earth's crust at any given time — and it was the last element to be discovered in nature. [ 5 ] [ 6 ] (Five elements that were discovered synthetically were later found to exist in nature: technetium , promethium , astatine , neptunium ...
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It is the least electronegative element with stable isotopes, of which it has only one, caesium-133. Caesium is mined mostly from pollucite, while the radioisotopes, especially caesium-137, are extracted from waste produced by nuclear reactors. German chemists Robert Bunsen and Gustav Kirchhoff discovered caesium in 1860 by flame spectroscopy.
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