Conventional superconductor
Conventional superconductors are materials that display superconductivity as described by BCS theory or its extensions.
Critical temperatures of some simple metals:
Would be nice to have something about Type-I vs Type-II superconductors, and a table with the Tc of some simple alloys. (The discussion of Type-I vs Type-II superconductors does not belong here imho because it is also releveant for high-temperature superconductors)
Element Tc (K) Al 1.20 Hg 4.15 Mo 0.92 Nb 9.26 Pb 7.19 Ta 4.48 Ti 0.39 V 5.30 Zn 0.88