The chemical element iodine has exactly 53 protons. The element also has 53 electrons, since all atoms have the same number of protons as they do electrons in order to make the atom neutral.
Iodine also has 74 neutrons, an atomic number of 53 and a rounded atomic weight of 127 atomic mass units. The element is classified as a halogen, and is found in group 17 of the periodic table with the remaining halogens. All of the halogens include fluorine, chlorine, bromine, iodine and astatine. These elements all have similar characteristics, all have seven valence electrons and all form salts with other molecules.