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(a) The dot-and-cross diagram of the simplified LDQ structure of digermyne. The nuclei are as indicated and the electrons are denoted by either dots or crosses, depending on their relative spins. The ellipse in the centre indicates the relative disposition of the electrons around the germanium-germanium internuclear axis.
[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.
Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply. By using this site, ... Dot and cross diagram.
2 CuCl 2 → 2 CuCl + Cl 2 The reported melting point of copper(II) chloride of 498 °C (928 °F) is a melt of a mixture of copper(I) chloride and copper(II) chloride. The true melting point of 630 °C (1,166 °F) can be extrapolated by using the melting points of the mixtures of CuCl and CuCl 2 .
The crystal structure of the dihydrate was partially determined in 1927 by Hendricks and Dickinson [1] [4] and refined in 1934 by Chrobak. [5] The structure is tetragonal P4 2 /mnm (136), Z=2, isostructural with ammonium tetrachoridocuprate(II) (NH 4) 2 CuCl 4 ·2 H 2 O and rubidium tetrachoridocuprate(II) Rb 2 CuCl 4 ·2 H 2 O.
Phenol [2] 22.93 0.1177 Phosphine: 4.692 0.05156 Propane: 8.779 0.08445 1-Propanol [2] 16.26 0.1079 2-Propanol [2] 15.82 0.1109 Propene [2] 8.442 0.0824 Pyridine [2] 19.77 0.1137 Pyrrole [2] 18.82 0.1049 Radon: 6.601 0.06239 Silane: 4.377 0.05786 Silicon tetrafluoride: 4.251 0.05571 Sulfur dioxide: 6.803 0.05636 Sulfur hexafluoride [2] 7.857 0. ...
structure geometry comments [ZrCl 6] 2−: yellow d 0: octahedral Zr-Cl distance = 2.460 Å (Me 4 N +) 2 salt [27] [Zr 2 Cl 10] 2−: colorless (d 0) 2: edge-shared bioctahedral Zr-Cl = 2.36 Å (terminal), 2.43 Å (bridging) N(PCl 3) 2) + salt [4] Nb 2 Cl 10: yellow (d 0) 2: edge-shared bioctahedral [Nb 2 Cl 10] 3.99 Å [28] [NbCl 6] − ...
Diagram from 1931 showing the Andrussow process. The Andrussow process is the dominant industrial process for the production of hydrogen cyanide. [1] It involves the reaction of methane, ammonia, and oxygen. The process is catalyzed by a platinum-rhodium alloy. [2] 2 CH 4 + 2 NH 3 + 3 O 2 → 2 HCN + 6 H 2 O