Question

what are polyatomic ions?
what is the name for the cro4^-2 ion?
chromoxide
chromate
dichromate

Explanation:

Chromate ion is a common polyatomic ion with the formula \(CrO_4^{-2}\). Chromoxide is not a standard name for this ion. Dichromate ion has the formula \(Cr_2O_7^{-2}\).

Answer:

chromate