A compound. As a solid, table salt consists of sodium cations (Na+) and chlorine anions (Cl-) which are arranged into a giant ionic lattice structure (which is held in place by the electrostatic attraction between the opposite charges on the ions) - the structure does not conduct electricity.
In solution, this structure is lost as the salt dissolves; the oppositely charged ions are free to move about and pass each other, enabling the solution to conduct electricity.
I would say that in solution or in a 'mixture' - depending on whether it is saturated, that it is a homogenous mixture as there is no physical difference in the state of the components of the mixture.
Na+Cl-
Milk is a homogeneous mixture.
Homogeneous mixture
It is an element.
Chocolate milk is a heterogeneous mixture.
Vinegar is a homogeneous mixture.
Heterogeneous mixture.
heterogeneous
Heterogenous
Homogeneous mixture
Milk is a homogeneous mixture.
Homogeneous mixture
homogeneous mixture
Homogeneous mixture
It is an element.
Chocolate milk is a heterogeneous mixture.
it's a compound
Aluminum is an element.