Relationship between electrical resistivity and density

I'm confused by the plot in the answer above. The density of gold is about 19, platinum about 21. The densest metal is osmium 22.6 g/cc. What are all the points above 23 (most of the chart)? I think this is a plot of resistivity vs. atomic number!

Here is a plot of density vs resistivity. There is no high order correlation but the data does seem to have a frontier on the left hand side (low resistivity). Silver, copper, aluminum, calcium, sodium and lithium define a boundary of low resistivity vs low density. Resistivity depends on electron density, which is roughly equal for all of the metals and electron mobility which is highly dependent on the mass of individual atoms in the metal lattice so there is reason to believe that this contributes... but it is clearly not the only effect.

The red points are stable metals used in the semiconductor industry to get low resistivity. Ca, Na and Li are highly reactive and not really useful in this regard.

The optical density of the medium is not the same as the physical density. The physical density of a material refers to its weight to volume ratio. The optical density of a material refers to the distance between the atoms of the medium.

https://www.physicsclassroom.com/class/refrn/Lesson-1/Optical-Density-and-Light-Speed

So I assume that electrical density is also something other than physical density. By cooling the material, i.e. reducing the distance of atoms from each other and changing the level of electron shells in atoms, the electric forces also change in the atom.

https://www.researchgate.net/publication/277969319_Applications_of_Nanostructured_Carbon_Materials_in_Constructions_The_State_of_the_Art

https://www.seas.harvard.edu/haulab/publications/pdf/Ginsberg-Garner-and-Hau-Nature-445-623-(2007).pdf

If the distances between atoms change, the probability of hitting an electron with an atom also changes - the electrical resistance. If the levels of the electron shells change, the forces needed to knock the electron out of the atom also change.

Sorry for My English.