Question

A scientist is trying to determine whether a certain substance is radioactive. Which question would be most helpful to ask?

Answer 1

well a question to ask would be if the mass of the material has changed significantly as that would determine that the substance is radioactive or if there have been any high readings found by a Geiger meter in certain period of time

hope that helps 

Answer 2

Answer:

C. Do the atoms that make up the substance have nuclei that split apart over time?

Explanation:

its right lol