What Is a Cul Ionic Compound?

One use for copper iodide is
••• Hemera Technologies/Photos.com/Getty Images

CuI is the elemental symbol abbreviation for the ionic chemical compound copper (I) iodide, also known as cuprous iodide. CuI is a solid formed from a mixture of the metallic element copper and the halogen iodine. It has various applications in chemistry and industry.

Ionic Compounds

An ionic compound forms when an atom of one element donates one or more electrons to an atom of a different element. The first atom becomes positively charged and the second becomes negatively charged. The two atoms now stick together due to the electrostatic attraction between their opposite charges. This is known as an ionic bond. Sodium chloride, or table salt, is a well-known ionic compound.

About CuI

CuI is an ionic compound that has each molecule made from one atom of copper (Cu) and one atom of iodine (I). The copper atom is positively charged and the iodine is negatively charged, so there is an ionic bond between them. It is written in full as copper (I) iodide to show that the copper has an oxidation state of 1, which means it has given up one electron.


CuI is a white crystalline powder with a density of 5.7 grams per cubic centimeter. It melts at 606 degrees C. It is essentially insoluble in water, which is unusual for an ionic compound. It is found naturally as the mineral marshite but can also be synthesized chemically.


CuI is an ingredient in various synthetic chemical reactions. It is also added to nylon to increase resistance to heat and light and has been used to produce a test paper to show the presence of mercury vapor. CuI has been used to "seed" clouds to produce rain.

Related Articles

Chemical Reactions That Cause Color Change
What is Ethanolic Potassium Hydroxide?
What Is the Gas Used in Neon Signs that Produces a...
What Is the Metallic Ion in the Compound CuCl2?
How to Build a Clorox Bleach Battery
Where Is the Mineral Topaz Found?
Elements Found in Household Products
Sulfuric Acid & Chlorine Bleach Reaction
What Is Zinc Alloy?
3 Different Forms of Brass
Reduction of Camphor to Isoborneol
How to Make a Sodium Silicate Solution
The Common Uses for Tartaric Acid
How to Make Sodium Nitrate
Three Types of Aqueous Reactions
How to Dissolve EDTA in Water
The Use of Phosphorous in Light Bulbs
How to Make a Pure Sample of Potassium
Industrial Uses of Iodine
Why Does Phenolphthalein Change Color?

Dont Go!

We Have More Great Sciencing Articles!