On Sunday, April 12, 2020 at 5:55:29 AM UTC-10, Marc Roussel wrote:   
   > On Saturday, April 11, 2020 at 11:33:20 AM UTC-6, omni...@gmail.com wrote:   
   >   
   > > The " transition-metal crystals" that are transparent will be studied,   
   > > or you could give an example of a chromium crystal that is transparent.   
   >   
   > In order to get a chromium compound with a d0 configuration, you would have   
   to have chromium in the Cr(V) oxidation state, but there aren't many compounds   
   like that.   
   >   
   > Crystalline scandium(III) compounds should be transparent in the visible   
   range.   
   >   
   > > The conductive indium tin oxide is transparent, like glass, across   
   > > many colors.   
   >   
   > Interesting. I guess these transparent conductive oxides are semiconductors   
   with band gaps just big enough not to absorb in the visible.   
      
   Chromium (V), with five bonds, is existing because the nucleus has two rings of   
   protons, with each ring made from ten protons. See photo:   
      
   https://pyramidalcube.blogspot.com/p/chromium.html   
      
   The white protons and brown neutrons are in a structure called   
   the tetrahexahedron (pyramidal cube). This produces self-passivation.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)