Chain Reaction is a continuous, self-sustaining series of fission reactions in a mass of Uranium or Plutonium.
Fission is a type of nuclear reaction that is used to release energy in nuclear reactors. It occurs when a nucleus of uranium or another heavy element is split into two simmilar parts.
Fusion is a type nuclear reaction that occurs when two lightweight nulcei fuse (combine) and form a heavier nucleus. Fusion produces the sun's energy.
Nucleus is the core of an atom and carries a positive charge. The nuclei of all elements - except (H)hydrogen - consist of protons and neutrons. Ordinary hydrogen consists of 1 proton & no neutron.
Neutron is an electically uncharged (neutral) particle in a nucleus.
Proton is a posetively charged particle in a nucleus.
Nuclear Reaction involves a change in the structure of a nucleus. Fission, Fusion and Radioactive decay are the most important types of nuclear reactions.
Isotopes are different forms of the same element. Their atoms, also called isotopes, have different mass numbers.
Mass number is the total number of protons and neutrons in the nucleus of an atom.

FISSION

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FUSION