Question

a polyatomic ion has the formula mno₄⁻. what is the name of this ion?

Explanation:

The polyatomic ion \( \text{MnO}_4^- \) consists of manganese (Mn) and oxygen (O). In this ion, manganese is in a +7 oxidation state, and the ion is named permanganate ion. This is a common polyatomic ion in chemistry, where the prefix "per-" and suffix "-ate" indicate the highest oxidation state of the central metal (manganese here) in the oxyanion.

Answer:

Permanganate ion (or specifically, the permanganate anion)