Cadmium oxide, with the chemical formula CdO, is a chemical compound composed of cadmium (Cd) and oxygen (O) atoms. It is an inorganic compound and one of the common oxides of cadmium.

Here are some key points about cadmium oxide:

1. Structure: Cadmium oxide has a simple binary composition, with one cadmium atom bonded to one oxygen atom in the form of CdO.
2. Physical Properties: Cadmium oxide is a brownish or yellowish solid at room temperature. It can exist in different crystal structures, including cubic, hexagonal, and tetragonal forms.
3. Preparation: Cadmium oxide can be prepared by various methods, including the direct oxidation of cadmium metal in the presence of oxygen or air, or by thermal decomposition of cadmium salts.
4. Uses: Cadmium oxide has limited practical applications. It is primarily used in research and laboratory settings as a source of cadmium cations and oxide anions in various chemical reactions.
5. Toxicity: Cadmium and its compounds, including cadmium oxide, are toxic and can pose health hazards if ingested, inhaled, or come into contact with skin or eyes. 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 oxide is not widely used due to its limited practical applications and toxicity. It is primarily utilized in laboratory research and as a source of cadmium and oxide 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.