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Carl Wilhelm Scheele (German:, Swedish: [ˈɧêːlɛ]; 9 December 1742 – 21 May 1786 [2]) was a German Swedish [3] pharmaceutical chemist.. Scheele discovered oxygen (although Joseph Priestley published his findings first), and identified molybdenum, tungsten, barium, nitrogen, and chlorine, among others.
Barium found in the Earth's crust is a mixture of seven primordial nuclides, barium-130, 132, and 134 through 138. [15] Barium-130 undergoes very slow radioactive decay to xenon -130 by double beta plus decay , with a half-life of (0.5–2.7)×10 21 years (about 10 11 times the age of the universe).
Naturally occurring barium (56 Ba) is a mix of six stable isotopes and one very long-lived radioactive primordial isotope, barium-130, identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks) in 2001. [4]
Strassman became professor of inorganic chemistry and nuclear chemistry at the University of Mainz in 1946. [2] The Institute consisted of two departments: Mass Spectrometry and Nuclear Physics was Josef Mattauch's department, while Nuclear Chemistry was Strassmann's department. Mattauch was appointed director of the institute.
Wollaston discovered and isolated it from crude platinum samples from South America. [116] 53 Iodine: 1811 B. Courtois: 1811 B. Courtois Courtois discovered it in the ashes of seaweed. [117] The name iode was given in French by Gay-Lussac and published in 1813. [52] Davy gave it the English name iodine in 1814. [52] 3 Lithium: 1817 A. Arfwedson ...
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Lye – potash in a water solution, formed by leaching wood ashes. Potash – potassium carbonate, formed by evaporating lye; also called salt of tartar. K 2 CO 3; Pearlash – formed by baking potash in a kiln. Milk of sulfur (lac sulphuris) – formed by adding an acid to thion hudor (lime sulfur). Natron/soda ash/soda – sodium carbonate ...
Barium stars also show enhanced spectral features of carbon, the bands of the molecules CH, CN and C 2. The class was originally recognized and defined by William P. Bidelman and Philip Keenan. [1] Initially, after their discovery, they were thought to be red giants, but the same chemical signature has been observed in main-sequence stars [2 ...