Are some alkali metals better conductors than others?

I want to know if there is any difference at all between the alkali metals as far as conducting electricity goes.





```

Li 
Conductivity 1.08×10^7 S/m
Resistivity  9.26×10^(-8) mΩ
Na
Conductivity 2.18×10^7 S/m
Resistivity  4.59×10^(-8) mΩ
K
Conductivity 1.43×10^7 S/m
Resistivity  7.0×10^(-8) mΩ
Rb
Conductivity 8.0×10^6 S/m
Resistivity  1.25×10^(-7) mΩ
Cs
Conductivity 5.3×10^6 S/m
Resistivity  1.9×10^(-7) mΩ
Fr
Conductivity 1.4×10^6 S/m
Resistivity  7.1×10^(-7) mΩ

```



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Here is the *total resistivity* ρ (in $10^{-6}\ \Omega{}\,\textrm{m}$ at 273.16 K) from [Electrical resistivity of alkaline earth elements](http://dx.doi.org/10.1063/1.555598), 
T. C. Chi, *J. Phys. Chem. Ref. Data*, **1979**, *8*, 439-497:


Li 8.53


Na 4.33


K 6.49


Rb 11.54


Cs 18.75


Fr 28.00


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