Answer:
What is
nuclear Fission ?
--Nuclear fission is a process by which a large nucleus is split into two smaller nuclei, or fission fragments; nuclear fission takes place after the nucleus absorbs a neutron that usually is a product of another atom's radioactive decay.
--The newly-formed fission fragments have highly unstable neutron to proton ratios, which makes them extremely radioactive.
What is nuclear fission chain reaction?
--A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus.
-- This nucleus in turn produces neutrons, and the process repeats.
--The process may be controlled (nuclear power) or uncontrolled (nuclear weapons).
In the case of Uranium-235, nuclear fission creates a wide variety of fission fragments, such as
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