Final answer:
The type of reaction occurring in a nuclear bomb is Nuclear Fission, which involves splitting the nucleus of an atom into two smaller nuclei, releasing a large amount of energy.
Step-by-step explanation:
The type of reaction occurring in a nuclear bomb is Nuclear Fission. Nuclear fission is the process of splitting the nucleus of an atom into two smaller nuclei, releasing a large amount of energy in the process. In a nuclear bomb, this reaction is triggered by a chain reaction of nuclear fission reactions, resulting in a powerful explosion.
Learn more about Nuclear Fission in a Nuclear Bomb