what is cobalt oxide?\na. a chemical element\nb. a chemical compound\nc. a chemical mixture\nplease select…

Brief Explanations:

Cobalt oxide is formed by the chemical - bonding of cobalt and oxygen atoms. A chemical element is a pure substance made of only one type of atom. A chemical mixture is a combination of two or more substances that are not chemically bonded. Cobalt oxide is a chemical compound as it consists of two or more different elements (cobalt and oxygen) chemically combined in a fixed ratio.

Answer:

b. a chemical compound