Cadmium iodide, with the chemical formula CdI2, is a chemical compound composed of cadmium (Cd) and iodine (I) atoms. It is an ionic compound and belongs to the group of metal halides.

Here are some key points about cadmium iodide:

1. Structure: Cadmium iodide has an ionic crystal structure, consisting of cadmium cations (Cd2+) and iodide anions (I-) held together by ionic bonds.
2. Physical Properties: Cadmium iodide is a white crystalline solid at room temperature. It is sparingly soluble in water.
3. Preparation: Cadmium iodide can be prepared by the direct combination of cadmium metal or cadmium oxide (CdO) with iodine (I2) or by the reaction of cadmium carbonate (CdCO3) with hydroiodic acid (HI).
4. Uses: Cadmium iodide has limited practical applications. It is primarily used in research and laboratory settings as a source of cadmium cations and iodide anions in various chemical reactions.
5. Toxicity: Cadmium and its compounds, including cadmium iodide, are toxic and can pose health hazards if ingested or inhaled. Proper safety precautions and handling procedures should be followed when working with this compound.
6. Environmental Concerns: Cadmium and its compounds are also known to be harmful to the environment, and their release into the environment should be avoided.

Cadmium iodide is not a widely used compound due to its toxicity and limited practical applications. It is primarily utilized in laboratory research and as a source of cadmium and iodide ions in certain chemical reactions. Its toxicity requires careful handling and containment to ensure the safety of those working with the compound. As with any toxic substance, appropriate safety measures should be observed to prevent unnecessary exposure and potential hazards.