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Nearly one hundred percent of the mass of an atom (99.94%) is contained in the nucleus. The mass of the protons and the mass of the neutrons are almost the same. Electromagnetic force binds the electron cloud to the nucleus. A nearly identical force can allow atoms to bind together, forming molecules. Atoms exist as either electrically neutral, or ions.
Nucleus. Definition. noun, plural: nuclei. (general) The core or the central part around which other parts are grouped or gathered. (biology) The large, membrane-bounded organelle that contains the genetic material, in the form of multiple linear DNA molecules organized into structures called chromosomes.upplement. In biology, the major functions of nucleus are to maintain the integrity of DNA and to control cellular activities such as metabolism, growth, and reproduction by regulating gene expression. It has three main components: the nucleolus, the chromatin and the nuclear envelope.