Iodine - ASCII Periodic Table of the Elements

ASCII PERIODIC TABLE OF THE ELEMENTS

  I

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 °C): 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.

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 °C): 1.3E+15 μΩcm

Melting point: 113.7 °C
Boiling point: 184.4 °C

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