Here's how to understand the formula:

* Sn: This is the chemical symbol for tin.

* (II): This indicates that tin has a +2 oxidation state in this compound.

* OH: This represents the hydroxide ion, which has a -1 charge.

Since tin has a +2 charge and hydroxide has a -1 charge, we need two hydroxide ions to balance the charge, resulting in the formula Sn(OH)₂.