Iodine is the 61st element in terms of abundance, ... Atomic symbol (on the periodic table of the elements): I; Atomic weight (average mass of the atom): 126.90447; ...

This remarkable new iodine compound is derived from an as yet unisolated base , ... TUTTON, A. Iodine as a Base Forming Element. Nature 49, 442–443 (1894) . https://doi ...