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Children's Dictionary
cell a tiny unit of plant or animal life, having a nucleus and surrounded by a very thin membrane. [1/4 definitions]
electron a very small particle that moves outside the nucleus of an atom. Electrons have a negative charge.
fission the splitting of the nucleus of an atom into two or more nuclei. This makes more atoms of lighter elements and gives off large amounts of energy.
neutron a small particle present in the nucleus of all atoms except the hydrogen atom. Neutrons have no electrical charge. The mass of a neutron is about equal to the mass of a proton.
nuclear of, or having to do with, or being the nucleus of an atom or a cell. [1/3 definitions]
nuclei plural of "nucleus."
proton a tiny particle in the nucleus of an atom. A proton has a positive electrical charge.