Answer the following question given this paragraph: 

Radioactivity is the ability of an atom to emit, or give off, charged particles and energy from the nucleus. The charged particles and energy are called by the general term radiation . Only unstable nuclei emit radiation. When they do, they gain or lose protons. Then the atoms become different elements. (Be careful not to confuse this radiation with electromagnetic radiation, which has to do with the light given off by atoms as they absorb and then emit energy. ).


Q: What is the ability of an atom to emit, or give off, charged particles and energy from the nucleus?

 Choices:

- magnetism

- electrolysis

- electromagnetism

- radioactivity

A:
radioactivity
