Nucleus

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Nucleus

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1. The positively charged core of an atom with which is associated practically the whole mass of the atom but only a minute part of its volume. </dd>
A nucleus is composed of one or more protons and an approximately equal number of neutrons. The atomic number Z of the element indicates the number of protons in the nucleus. The mass number A of the element is the sum of the protons and neutrons. </dd>
2. In biology, a definitely delineated body within a cell containing the chromosomes. [[/a>|/a>]] </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use