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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.
Report Abuse. a nucleus (nucleii refers to more than one nucleus, it is the plural form of the word nucleus) is a core, the central and generally key or most important thing to the total structure. A nucleus, when discussing cells, is the area of the cell where genetic material resides. It has its own structural border (a semi-permeable wall separating it from the main cell mass). You must know what a cell nucleus is without needing further detail. It is a fairly basic term to cell biology.