Question

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

Explanation:

Step1: Define polyatomic ion

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

Step2: Analyze each option

• Cl−: Composed of only one chlorine atom, so it is a monatomic ion.
• ClO−: Composed of two atoms (Cl and O), so it is a polyatomic ion.
• NaCl: It is a compound, not an ion.
• Na+: Composed of only one sodium atom, so it is a monatomic ion.

Answer:

B. ClO−