Want this question answered?
yes
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."
No
A stable, nonradioactive atom must be formed.
Yes. All of the actinides are radioactive.
Its nucleus emits radioactive particles continuously.
Unstable atoms are said to be radioactive
Generally, the smaller the nucleus, the less radioactive.
8
The half-life
radioisotopes
A radioactive atom is an atom that has an unstable nuclear force, and therefore either absorbs or emits a radioactive particle.