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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.
everything is made up of atoms. Atoms consist of the. nucleus and negatively charged particles surrounding. the nucleus called electrons. Inside of the nucleus. are protons(positively charged particles)and neutrons. neutral particles). If the atom is not an isotope we. know that there must be an equal amount of protons and. neutrons. We also know that there has to be at least. one proton and one neutron inside of the nucleus.