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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 the cell's control center- that is, it contains the genetic information to do and make everything that goes on within a cell. The nucleus is surrounded by a nuclear envelope, which is a double membrane that protects the nucleus by filtering what can leave and enter (like the cell membrane), and separates the nucleus from the rest of the cell. The nucleus works with everything in the cell, since it has all the DNA needed to make everything.