The chemical formula of chromium(III) nitrate is Cr(NO₃)₃. Here's how to break it down:

* Chromium(III): This tells us the chromium ion has a +3 charge (Cr³⁺).

* Nitrate: This is the polyatomic ion NO₃⁻ with a -1 charge.

To balance the charges, we need three nitrate ions (3 x -1 = -3) to match the +3 charge of the chromium ion.