Iodine is a dark halogen that readily sublimes to violet vapour and is essential for thyroid hormone production.
Atomic number
53
Category
Halogen
Period
5
Group
17
State
Solid
Fun facts about Iodine
Iodised salt prevents many iodine-deficiency disorders.
The thyroid concentrates iodide to make hormones.
Iodine solutions can act as broad-spectrum antiseptics.
Common uses of Iodine
Antiseptics
Iodised salt
Medical imaging contrast compounds
Where Iodine sits in the periodic table
Iodine is classified as a halogen in period 5 and group 17 of the periodic table. Under the conditions represented in this reference, its state is solid.
Quick chemistry revision
For quick revision, pair the symbol I with atomic number 53 and the listed atomic mass 126.90. The summary, facts, and uses above keep those element properties together in one reference.