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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.
noun. A model of an atom showing the nucleus. A model of an atom showing the nucleus. The nucleus is the center core of an atom that has a positive charge and that contains most of the atom's mass, or the central heart of an organization or group.1  An example of a nucleus is the center core of an atom. model of an atom showing the nucleus. A model of an atom showing the nucleus. The nucleus is the center core of an atom that has a positive charge and that contains most of the atom's mass, or the central heart of an organization or group. 1  An example of a nucleus is the center core of an atom.