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All Chemistry

Iodine

53 I

Iodine

Halogen period 5 group 17 p-block discovered: 1811

As a chemical element

Properties of the atom — they do not depend on what substance it is part of.

Atomic number
53
Atomic mass
126.9045 a.m.u.
Electron configuration
[Kr]5s2 4d10 5p5
Electronegativity
2.66 on the Pauling scale
Atomic radius
198 pm
Ionization energy
10.451 eV
Electron affinity
3.059 eV
Oxidation states
+7, +5, +1, -1

As a simple substance

Properties of the substance these atoms form under ordinary conditions.

State at 25 °C
Solid
Melting point
386.85 K (113,7 °C)
Boiling point
457.55 K (184,4 °C)
Density
4.93 g/cm³

Materials about this element