Relative atomic mass: 126.90447 +- 0.00003

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

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

Discovery: 1811 Bernard Courtois (FR)
Iodine was discovered by Bernard Courtois (FR) in 1811. The origin of the name comes from the Greek word iodes meaning violet. It is a shiny, black, non-metallic solid with characteristic odour. It sublimes easily and as a gas it is violet and intensely irritating to the eyes, nose and throat. Iodine occurs on land and in the sea in sodium and potassium compounds. It is required in small amounts by humans. Iodine was 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.
Electronic configuration: [Kr] 4d10 5s2 5p5
Formal oxidation number: -1 +1 +5 +7
Atomic radius: 133.1 pm

Electronegativities: 2.66
Thermal conductivity: 0.449 W/(m K)
Electrical resistivity (20 oC): 1.3E+15 microOhm cm

Melting point: 113.7 oC
Boiling point: 184.4 oC

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

52Te <= 53I => 54Xe

ASCII Periodic Table of the Elements
6 Jan. 2020
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