The chemical formula "Cr₂O₇²⁻" represents the dichromate ion, which consists of two chromium atoms and seven oxygen atoms, carrying a negative two charge. It is commonly found in various chemical compounds and is known for its bright orange color. The dichromate ion is often used in laboratory settings and industrial processes, particularly in the production of pigments and as an oxidizing agent. Dichromate is derived from chromium, a transition metal, and is part of a larger family of chromates. It plays a significant role in inorganic chemistry and is important in applications such as water treatment and metal finishing. However, it is also considered toxic and carcinogenic, necessitating careful handling.