Which term best describes C2O4 2-? polyatomic anion polyatomic cation monatomic anion monatomic cation

Polyatomic anion

Explanation:

Polyatomic anion:

The polyatomic anion is substance having more than one atoms and carrying negative charge.

The poly is Greek word meaning "many". The given compound C₂O²⁻₄

is polyatomic anion because it is made up of more than one atom and have negative charge. The atoms in this compound act as a single unit. In this compound two carbon atoms combine with four oxygen atoms and oxygen carry - 2 charge.

In contrast to polyatomic anion, polyatomic cations are also exist. In polyatomic cations positive charge is present in compound and it is also made up of more than one atoms.