Question

Do u think mercury is an electrolyte?

Answer 1

mercury is metal and  metals general are not electrolytes, and they all conduct electricity, in solid or liquid form. That is because of their atomic structure; electrons that are not  free to move around the material. 
Electrolytes conduct electricity because positive and negative chemical ions are
free to move, not the individual electron.

Answer 2

An electrolyte is a substance which conducts electricity in the form of ions. Mercury conducts electricity through its electrons, so it is not an electrolyte.