# Electric conductivity

Well I was wondering why some materials have a higher resistivity than others . So I took two elements randomly . I picked carbon and silicon . Carbon has lower resistivity than silicon and obviously less atomic radius . Carbon single bond with another atom of carbon is stronger than the single bond of a silicon atom with another silicon atom . So the bond length of the C-C bond is less than the bond length of Si-Si . Both Carbon and Silicon form a lattice . How is this possible? Why is Carbon a better conductor than Silicon . Does it have to do with any of the chemical properties I wrote down?