Question

what is the name for the emission of rays and particles by a radioactive material?
decay
nuclear reactivity
radiation
radioactive series

Explanation:

Radiation is the emission of rays and particles by a radioactive material. Decay refers to the process of a radioactive nucleus changing. Nuclear reactivity relates to the ability of a nuclear system to sustain a chain - reaction. A radioactive series is a sequence of radioactive decays.

Answer:

C. radiation