* Barium (Ba) is a Group 2 element, meaning it forms ions with a +2 charge (Ba²⁺).

* Hydroxide (OH) is a polyatomic ion with a -1 charge (OH⁻).

To form a neutral compound, the charges must balance. This means you need two hydroxide ions for every one barium ion:

Ba²⁺ + 2OH⁻ → Ba(OH)₂

The correct chemical name for Ba(OH)₂ is Barium hydroxide.