The compound HI is known as hydrogen iodide. It is a diatomic molecule made up of one hydrogen atom and one iodine atom.
In this compound, hydrogen (H) has an oxidation state of +1, while iodine (I) has an oxidation state of -1. This results in a neutral compound overall. Hydrogen iodide is a colorless gas at room temperature and it readily dissolves in water to form hydroiodic acid.
The naming convention used here follows standard IUPAC nomenclature rules for binary compounds. The name is derived from the elements that constitute the compound, with hydrogen mentioned first followed by iodine. The ‘ide’ suffix indicates that iodine is present in its anionic form.