The correct statement for the molecule CsI₃ is that it contains Cs⁺ and I₃^– ions. This is because CsI₃ is an ionic compound formed by cesium (Cs) and the triiodide ion (I₃^–). Cesium, being an alkali metal, readily loses one electron to form Cs⁺ ion. Iodine can form polyhalide ions like I₃^–, which is linear and symmetric, consisting of three iodine atoms with a negative charge. The compound is not covalent, nor does it contain Cs³⁺ or free I₂ molecules; it is purely ionic with Cs⁺ and I₃^– as the constituent ions.

Related Topics and Formulae

Polyhalide Ions: These are ions formed by the combination of halogens, such as I₃^–, ICl₂^–, etc. They are stable due to the large size and high polarizability of iodine atoms.

Ionic Compounds: Formed by the transfer of electrons from metal to non-metal, resulting in positively charged cations and negatively charged anions held together by electrostatic forces.

Formula for Triiodide Ion: I₃^– is represented as $I_3^{-}$, and its structure is linear: I–I–I.