Concept:Neutrons are uncharged particles, so they can penetrate the nucleus easily to trigger artificial radioactivity.
Explanation:The nucleus is positively charged.
This positive charge repels any other charged particles, such as protons or alpha particles.
Neutrons have zero charge, meaning they are electrically neutral.
Therefore, the nucleus does not repel neutrons.
Neutrons can freely approach and enter the nucleus.
Once absorbed, the nucleus becomes unstable and emits radiation, producing artificial radioactivity.
Answer:B. have no charge