Question

Which property would be least helpful in determining whether a substance is a metal or a nonmetal?

Answer 1

Thermal and electric conductivities.

Step-by-step explanation:

Metals tends to have high thermal and electric conductivities in comparison with nonmentals.

Answer 2

The answer is state.

That is the state would be least helpful in determining whether a substance is a metal or a nonmetal. The state can only tells that a compound is liquid, gas or solid. But it can't tell whether a substance is metal or non-metal. So it is the least helpful in determining whether a compound is metal or non-metal.