If $d$ is the ratio of the total number of electrons in a compound and the average radius(of all anions and cations, or covalent radii), are there known compounds (inorganic or organic) where $d$ is high?

Are there any rules or analytic techniques to design such compounds that have stable chemistry?

Please don't confuse the electron density in the title to this one

Edit: Assume the constraint that we want common elements and no exotic, radioactive ones.


closed as unclear what you're asking by Mithoron, Todd Minehardt, airhuff, M.A.R., Nilay Ghosh Mar 23 '18 at 12:37

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  • $\begingroup$ Your d is high where the atomic number is high. $\endgroup$ – Ivan Neretin Mar 22 '18 at 4:43
  • $\begingroup$ @IvanNeretin: Edited. Consider the effect of average radius as well. $\endgroup$ – batta Mar 22 '18 at 4:51
  • $\begingroup$ I still stand by my statement. $\endgroup$ – Ivan Neretin Mar 22 '18 at 5:12

Mercury has 80 electrons and a covalent radius of 132 picometers.


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