Iodine - Periodic Table of the Elements

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PERIODIC TABLE OF THE ELEMENTS version 1.7


 I

English:  Iodine
French: Iode
Croatian: Jod
German: Iod
Italian: Iodio


Atomic number: 53
Group numbers: 17
Period: 5
Standard state (20 °C): solid

Iodine was discovered by Bernard Courtois (France) in 1811. The origin of the name comes from the Greek word iodes meaning violet. It is shiny, black, non-metallic solid with characteristic odour. Sublimes easily and as a gas it is violet and intensely irritating to the eyes, nose and throat.

Electronic configuration: [Kr] 4d¹⁰ 5s² 5p⁵
Relative atomic mass: 126.90447(3)
Formal oxidation number: -1 +1 +5 +7

Electronegativities: 2.66
Thermal conductivity: 0.449 W/(m K)
Electrical resistivity (20 °C): 1.3E+15 μΩcm

Atomic radius: 133.1 pm
Density (g/dm3): 4930 (293 K)
Molar volume (cm3/mol): 25.74 (293 K)

Melting point: 113.7 °C
Boiling point: 184.4 °C
Critical temperature: 546 °C

Heat of fusion: 15.27 kJ/mol
Heat of vaporization: 41.67 kJ/mol
Heat of atomization: 107.24 kJ/mol

Iodine occurs on land and in the sea in sodium and potassium compounds. Required in small amounts by humans. Once used as an antiseptic, but no longer due to its poisonous nature. The price of 99.5 % pure crystalline iodine is 140.50 € for 1000 g. 52Te <= 53I => 54Xe ___________________ If you have comments, corrections or suggestions about this site, please send me a e-mail. Periodic Table of the Elements __________________________________ Last modified: 29.03.2003 Copyright © 1998-2003 by Eni Generalic