What is the chemical symbol for the Hydroxyl ion?

The chemical symbol for the Hydroxyl ion is denoted as OH-. This means it consists of one oxygen atom (O) covalently bonded to one hydrogen atom (H), while carrying a negative charge. The negative charge indicates that the Hydroxyl ion has gained an extra electron, which provides it with its characteristic properties and behavior in chemical reactions.

A is a close representation of the Hydroxyl ion, but it does not indicate the negative charge that distinguishes it as an ion. B, representing water (H2O), and C, which is not a conventional or recognized formula, do not accurately reflect the structure or the charge of the Hydroxyl ion. Thus, D accurately captures the identity and charge of the Hydroxyl ion, making it the correct answer.