Iodine
chemical element with symbol I and atomic number 53 / From Wikipedia, the free encyclopedia
Iodine is a chemical element. Its atomic number (which is the number of protons in it) is 53, and its atomic mass (the number of protons plus neutrons) is 127. It is part of the Group 7 (halogens) on the periodic table of elements and its electronic configuration is 2,8,8,18,17.[1] It is a nonmetal.