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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.
In botany, the nucleus refers to the central kernel of a nut or seed, or the center of a starch granule. In neuroanatomy, a nucleus pertains to a cluster of cell bodies of nerve cells in the brain or spinal cord. In other scientific fields, the term nucleus may generally refer to the core or the central part around which other parts are grouped or gathered. For instance, in Physics, a nucleus refers to the positively-charged center of an atom that usually contains the protons and neutrons.