Question

which of the following is a characteristic of alpha particles? they are negatively charged they are stopped by a piece of paper they are not dangerous if ingested they can penetrate through metal

Explanation:

Alpha - particles are positively charged helium nuclei. They have low - penetrating power and can be stopped by a piece of paper. They are dangerous if ingested as they can cause significant damage to internal tissues. They cannot penetrate through metal.

Answer:

They are stopped by a piece of paper