What term is used to describe elements with unstable nuclei?

What term is used to describe elements with unstable nuclei?

Correct Answer: radioactive
waste
explosive
larvae

Explanation: Gamma rays are produced when radioactive elements decay. Radioactive elements are elements with unstable nuclei. To become more stable, the nuclei undergo radioactive decay. In this process, the nuclei give off energy and may also emit charged particles of matter. Types of radioactive decay include alpha, beta, and gamma decay. In alpha and beta decay, both particles and energy are emitted. In gamma decay , only energy, in the form of gamma rays, is emitted.

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