Cr2O7, or dichromate, is a chemical compound composed of two chromium atoms and seven oxygen atoms. It is commonly found in the form of potassium dichromate (K2Cr2O7), a bright orange salt used in various industrial applications, including dyeing and as a corrosion inhibitor. Dichromate ions are known for their strong oxidizing properties, making them useful in chemical reactions. However, they are also toxic and carcinogenic, which raises safety concerns in handling and disposal. Proper precautions are essential when working with compounds containing Cr2O7.