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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 nucleus is a round organelle which serves as the brain of a cell, controlling many of the jobs. The nucleus contains DNA assembled into chromosomes. Chromosomes, shaped like an âXâ or squiggly line inside the nucleus, are responsible for growth and reproduction. They help insure that any new cells are perfect copies. Also inside the nucleus is the nucleolus which is responsible for making ribosomes.