Here's how to break down the formula:

* Pb: This represents the lead ion (Pb²⁺). Lead(II) indicates that the lead ion has a +2 charge.

* (NO₃)₂: This represents the nitrate ion (NO₃⁻), which has a -1 charge. The subscript "2" indicates that there are two nitrate ions to balance the +2 charge of the lead ion.

* (aq): This indicates that the lead(II) nitrate is dissolved in water, forming an aqueous solution.