The Element Iodine


Iodine naturally occurs in the environment as dissolved iodide in seawater; but also found in some minerals and soils. Iodine is one of the elements essential for animal life as it helps the production of certain chemicals and enzymes. Iodine is found as a mineral in Chile and the rest is found in seaweeds and seawater.

Iodine mixed with ethanol is one of the prominent solutions for disinfecting wounds and to sanitize surface water for drinking. Iodine compound are heavily used in the experiments of organic chemistry. In the industry of photography, iodine is used as “silver iodide” and also “tungsten iodide” is used to stabilize the filaments in light bulbs.

Atomic Number & Chemical Properties


Element Basics:

Chemical Symbol: I
Atomic Number: 53
Atomic Weight: 126.90447
Element Classification: Halogen
Discovered By: Bernard Courtois
Date of Discovery: 1811 (France)
Origin of Name: Greek: iodes (violet colored).

How to Recognize it at a Party:

Shiny, black nonmetallic solid

Seriously Atomic Information:

Density (g/cc): 4.93
Melting Point (°K): 386.7
Boiling Point (°K): 457.5
Atomic Radius (pm): n/a
Atomic Volume (cc/mol): 25.7
Covalent Radius (pm): 133
Ionic Radius: 50 (+7e) 220 (-1e)
Pauling Negativity Number: 2.66
First Ionizing Energy (kJ/mol): 1008.3
Oxidation States: 7, 5, 1, -1
Electronic Configuration: [Kr] 4d10 5s2 5p5

Getting Intimate with Iodine:

Lattice Structure: Orthorhombic (ORC)
Lattice Constant (Å): 7.720
Lattice C/A Ratio: n/a
Specific Heat (@20°C J/g mol): 0.427 (I-I)
Fusion Heat (kJ/mol): 15.52 (I-I)
Evaporation Heat (kJ/mol): 41.95 (I-I)
Thermal Conductivity (@25°C W/m K):
Debye Temperature (°K): n/a


Society's Questions About Iodine:

Have you ever wondered what everyone else in the world thinks about Iodine? Is anyone else looking for it too? If so, why? What do they want?

The following list shows the most common online questions about the element Iodine. Are your questions the same or different from everyone else's?

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