Conventional superconductor

Conventional superconductors are materials that display superconductivity as described by BCS theory or its extensions.

Critical temperatures of some simple metals:

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

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)