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I

Iodine

Atomic number 53 ยท halogen ยท Period 5, Group 17

โš›๏ธ
53Atomic Number
โš–๏ธ
126.904Atomic Mass (u)
๐Ÿท๏ธ
halogenCategory
๐Ÿ”ฌ
CourtoisDiscovered by

01 About Iodine

Sublimes directly from solid to purple vapour at room temperature. Essential for thyroid hormones. Iodine-131 is used in nuclear medicine and was released at Chernobyl.

02 Physical Properties

State at room temperature๐Ÿชจ Solid
Melting point113.7 ยฐC
Boiling point184.3 ยฐC
Density4.933 g/cmยณ
Atomic mass126.904 u
Electron configuration2,8,18,18,7
Period / GroupPeriod 5, Group 17
BlockP-block

03 Discovery

Iodine was discovered in 1811 by Courtois.