A scientist is trying to determine whether a certain substance is radioactive. Which question would be most helpful to ask? Does the substance have a positive electric charge or a negative electric charge? Can the substance be used to generate electricity in a power plant? Do the atoms that make up the substance have nuclei that split apart over time? Do the nuclei of the substance’s atoms contain more neutrons than protons?

The question would be most helpful to ask is that can the substance be used to generate electricity in a power plant and Do the atoms that make up the substance have nuclei that split apart over time.

What is radioactive substances?

Radioactive substances are those substances whose nucleus is unstable due to presence of extra number of neutons or protons.

Radioactive susbatnces are the whole atoms, are not present in ionic form so it is not possible that they may have positive or negative charge.
Some radioactive substances are used in nuclear power plant to generate power like uranium and power is generated due to nuclear fission process.
As radioactive substance will have unstable nuclei and to get stable nuclear fission process is occur in that substance as a result of which high energy or radiations is produced.
Unstability of nucleus of radioactive substance is due to the presence of more neutrons than protons or sometimes due to more protons than neutrons.

Hence radioactive substances are used to generate electricity and contain more neutrons than protons.

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