Tellurium Xenon

Iodine (I)

From Wikipedia, the free encyclopediaIodine is a chemical element with symbol I and atomic number 53. The name is from Greek ἰοειδής ioeidēs, meaning violet or purple, due to the color of iodine vapor. Iodine and its compounds are primarily used in nutrition, and industrially in the production of acetic acid and certain polymers.

Iodine in the periodic table

Symbol

Atomic number

Group

Period

Block

Element category

Nonmetal

Physical properties

Phase at STP

Solid

Density

4.933 g/cm³

Atomic weight

126.904 u

Melting point

386.85 K
113.7 °C
236.66 °F

Boiling point

457.4 K
184.25 °C
363.65 °F

Atomic properties

Electronegativity (Pauling Scale)

2.66

Electron affinity

295.153 kJ/mol

Oxidation states

−1, +1, +3, +4, +5, +6, +7
(a strongly acidic oxide)

Ionization energies

1	1008.4 kJ/mol
2	1845.9 kJ/mol
3	3180 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)

[Kr] 4d¹⁰ 5s² 5p⁵

Electron configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁵

Electrons per shell

2, 8, 18, 18, 7

History

Discovered

1811

Discovered by

Bernard Courtois