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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.
The term nucleus (kern in the old German literature, where for example the mandelkern mean the almond nucleus and referred to the amygdala) meant a collection of nerve cell bodies in a subcortical structure in the brain, but occasionally also in the spinal cord (as in Clarke's nucleus or Onuf's nucleus).