Question

what is different between nuceluer fission an fusions

Answer 1

Nuclear fission is a process in nuclear physics in which the nucleus of an atom splits into two or more smaller nuclei as fission products, and usually some by-product particles.

a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.

Answer 2

Nuclear Fission == Nuclear Fusion
Definition Fission is the splitting of a large atom into two or more smaller ones.
Nuclear Fusion == Fusion is the fusing of two or more lighter atoms into a larger one.