What is exoenergic nuclear reaction?

What do you mean by nuclear reaction? What quantities are conserved in nuclear reaction? What is Q-value of nuclear reaction?

What is a nuclear fission reaction?

What is self-sustained nuclear reaction?

Ideentify the part of the electromagnetic spectrum,which is produced in nuclear reaction.

What is meant by nuclear chain reaction? Explain, why uranium "_92U^238 is not suitable for chain reaction.

State the advantages of the nuclear fusion reactions over nuclear fission reactions.also state one disadvantage.