Which statements about radioactive decay are true? Check all that apply.

Radioactive decay begins when one type of atom becomes another.

Radioactive elements occur in nature.

Carbon-14 decays into nitrogen-14.

Explanation:

Radioactive decay is the spontaneous breakdown of an atomic nucleus resulting in the release of energy and matter from the nucleus. We can think of radioactive isotopes as always attempting to stabilize themselves, and to accomplish this, they will release amounts of energy into stable elements. This process also occurs in nature and by man.