Question

which chemical formula represents a polyatomic ion? (1 point) na+ nacl clo- cl-

Explanation:

A polyatomic ion is an ion composed of more than one atom.

• $\ce{Na+}$ is a monatomic ion (composed of one sodium atom).
• $\ce{NaCl}$ is a compound (sodium chloride), not an ion.
• $\ce{ClO-}$ is composed of two atoms (Cl and O) and has a charge, so it is a polyatomic ion.
• $\ce{Cl-}$ is a monatomic ion (composed of one chlorine atom).

Answer:

$\ce{ClO-}$