Final answer:
The name of the polyatomic ion with the formula SO32- is the sulfite ion.
Step-by-step explanation:
The polyatomic ion with the molecular formula SO32- is called the sulfite ion. Polyatomic ions like this one consist of a group of atoms that are bonded together and have an overall electric charge. The sulfite ion includes one sulfur atom and three oxygen atoms, carrying an overall charge of 2- (minus two). The naming of polyatomic ions often follows a pattern where the ion with one less oxygen atom than the -ate ion has the suffix -ite instead. Therefore, since the sulfate ion is SO42-, removing one oxygen atom gives us the sulfite ion SO32-.