Final answer:
The elements in order of increasing conductivity are: He, Te, Tl.
Step-by-step explanation:
The elements in order of increasing conductivity are: He, Te, Tl.
Helium (He) is a noble gas and has very low conductivity due to its stable electron configuration.
Tellurium (Te) is a metalloid and has higher conductivity compared to helium.
Thallium (Tl) is a metal and has the highest conductivity among the elements in the given list.
Learn more about conductivity of elements