On the periodic table, iodine belongs to the V11A family or group 17, which contains the halogens. Groups and families are the vertical columns on this table. In the old system of naming families, scientists used Roman numerals. However, the new convention uses the term "groups" to identify these columns.
Iodine is a non-metal that has the atomic number of 53. Its atomic weight is 129.9 grams per mole. The name of this element comes from the Greek word "iodes," which means violet. Barnard Courtois discovered this halogen element in 1811.
The different uses of iodine and its compounds include testing for the presence of starch in chemistry labs and uses as antiseptics and treatments for thyroid gland disorders.