The list of elements in order from most conductive to least conductive is; potassium (K), germanium (Ge), selenium (Se).
Conductivity is a property of metals. The more "metallic" an element is, the greater its conductivity.
The most metallic element in the list is Potassium hence it has the highest conductivity (1.4×107 S/m) followed by germanium which is a semiconductor (2000 S/m). Selenium has the least electrical conductivity.
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