That's really two questions,
"What are the uses of Nuclear fission reaction?" and
"What are potential uses of nuclear fission?".
See the "Related questions" below for answers to each question.
Nuclear bombs
nuclear fission
Nuclear weapons
No, they rely on fission. Controlled fusion is the holy grail of nuclear power.
The fission of U-235 and Pu-239
No, an atomic bomb uses fission, but a nuclear or thermonuclear bomb combines fission and nuclear fusion. Therefore, a nuke is more powerful than an atom bomb.
The most popular use is of Uranium 235 isotope which is used in nuclear fission which helps create nuclear energy.
One use is in nuclear power plants to produce steam and turn turbines to generate electricity.Nuclear bombs ^.^
An atomic bomb uses nuclear fission at the atomiclevel to detonate several tons of explosives.
If you are asking which has the maximum danger, a hydrogen bomb is one type of nuclear bomb. In general, nuclear bombs can be fission (called atomic) or fusion (hydrogen) A fusion bomb is larger than an fission bomb, and actually uses a fission bomb to start the fusion reaction.
This is not correct. Assuming "Using Nuclear Energy" means using it to generate electricity in a reactor. A nuclear reactor is a power plant, that uses nuclear fission to eventually generate electricity. An atom bomb also uses nuclear fission to generate energy causing an explosion. However, due to fundamental differences between the two a nuclear reactor cannot explode like an atom bomb.
A nuclear reactor uses either nuclear fission or nuclear fusion to generate electricity, while bio-reactors use the excretions of many animals to generate electricity.