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[1] [2] [3] Introduced by Gilbert N. Lewis in his 1916 article The Atom and the Molecule, a Lewis structure can be drawn for any covalently bonded molecule, as well as coordination compounds. [ 4 ] Lewis structures extend the concept of the electron dot diagram by adding lines between atoms to represent shared pairs in a chemical bond.
Strontium is a chemical element; it has symbol Sr and atomic number 38. An alkaline earth metal , strontium is a soft silver-white yellowish metallic element that is highly chemically reactive . The metal forms a dark oxide layer when it is exposed to air.
It is named after Warren K. Lewis (1882–1975), [6] [7] who was the first head of the Chemical Engineering Department at MIT. Some workers in the field of combustion assume (incorrectly) that the Lewis number was named for Bernard Lewis (1899–1993), who for many years was a major figure in the field of combustion research. [citation needed]
Also acid ionization constant or acidity constant. A quantitative measure of the strength of an acid in solution expressed as an equilibrium constant for a chemical dissociation reaction in the context of acid-base reactions. It is often given as its base-10 cologarithm, p K a. acid–base extraction A chemical reaction in which chemical species are separated from other acids and bases. acid ...
Lewis had been working on an experiment with liquid hydrogen cyanide, and deadly fumes from a broken line had leaked into the laboratory. The coroner ruled that the cause of death was coronary artery disease , because of a lack of any signs of cyanosis, [ 34 ] but some believe that it may have been a suicide.
A police officer dressed The Grinch arrests suspected drug dealers in Lima, Peru, on December 23, 2024.
The St. Petersburg City Council voted to approve bonds that would help fund a new $1.3 billion ballpark project and development in the region's Historic Gas Plant District on Thursday. The vote ...
Sulfur trioxide can be prepared in the laboratory by the two-stage pyrolysis of sodium bisulfate. Sodium pyrosulfate is an intermediate product: [17] Dehydration at 315 °C: 2 NaHSO 4 → Na 2 S 2 O 7 + H 2 O; Cracking at 460 °C: Na 2 S 2 O 7 → Na 2 SO 4 + SO 3; The latter occurs at much lower temperatures (45–60 °C) in the presence of ...