Compounds with high electron density [closed]








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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](https://en.wikipedia.org/wiki/Electron_density)


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




Mercury has 80 electrons and a [covalent radius](https://en.wikipedia.org/wiki/Covalent_radius) of 132 picometers. 


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