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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). Its abundance is ≈0.1% that of natural barium ...
This nuclide decays by double electron capture (absorbing two electrons and emitting two neutrinos), with a half-life of (0.5–2.7)×10 21 years (about 10 11 times the age of the universe). There are a total of thirty-three known radioisotopes in addition to 130 Ba.
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Baryte, barite or barytes (/ ˈ b ær aɪ t, ˈ b ɛər-/ BARR-eyet, BAIR-[7] or / b ə ˈ r aɪ t iː z / bə-RYTE-eez [8]) is a mineral consisting of barium sulfate (BaS O 4). [3] Baryte is generally white or colorless, and is the main source of the element barium.
The coordination number of Ba 2+ increases from 9 to 10. [13] In aqueous solution BaCl 2 behaves as a simple salt; in water it is a 1:2 electrolyte [clarification needed] and the solution exhibits a neutral pH. Its solutions react with sulfate ion to produce a thick white solid precipitate of barium sulfate. BaCl 2 + Na 2 SO 4 → 2 NaCl + BaSO 4
Equity premium puzzle: The equity premium puzzle is thought to be one of the most important outstanding questions in neoclassical economics. [6] It is founded on the basis that over the last one hundred years or so the average real return to stocks in the US has been substantially higher than that of bonds.
By 1829, Döbereiner had found other groups of three elements (hence "triads") whose physical properties were similarly related. [2] He also noted that some quantifiable properties of elements (e.g. atomic weight and density) in a triad followed a trend whereby the value of the middle element in the triad would be exactly or nearly predicted by taking the arithmetic mean of values for that ...