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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.

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closed as unclear what you're asking by Mithoron, Todd Minehardt, airhuff, M.A.R. ಠ_ಠ, 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
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Mercury has 80 electrons and a covalent radius of 132 picometers.

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