energy and fast-moving particles are released,
Atomic nuclei that are unstable and decaying are said to be radioactive. Radioactive decay involves alpha, beta and gamma particle emissions.
Radioactive decay
radioactive
It's Nuclei, the past answers are wrong.
All atoms are nuclear, in that they all have nuclei. Some atoms have unstable nuclei, making them radioactive. I'm afraid I have no idea what you mean by "nuclear atoms," unless you meant to say radioactive atoms, in which case the answer is "they have unstable nuclei and they're radioactive."
Atomic nuclei that are unstable and decaying are said to be radioactive. Radioactive decay involves alpha, beta and gamma particle emissions.
Radioactive decay or radioactivity
Yes
The term is "radioactive decay".
they come from the nuclei of an unstable atom.
Radioactive substances are unstable as a result of the extra neutrons present in the nuclei of the substance. Non radioactive substances are stable.
Radioactive metals are unstable as their nuclei is large and do not have a strong binding force as the smaller elements. If a neutron is collided onto a radioactive nuclei, they split into smaller atoms like Uranium splits into Barium and Krypton. Since they are unstable, they have a half life of varying times which range from the age of the earth to nanoseconds for recently discovered elements