A van der Waals' surface coloured according to charge, superimposed on a ball-and-stick model of the copper(II) nitrate monomer molecule, Cu(NO<sub>3</sub>)<sub>2</sub>. Red represents partially negatively charged regions, blue represents partially positively charged regions, and white represents neutral (uncharged) regions. Created in Accelrys DS Visualizer 1.5, edited with Photoshop Elements 3.0.
<a href="//commons.wikimedia.org/wiki/User:Zaloiane" title="User:Zaloiane">Zaloiane</a>
<span class="int-own-work" lang="en">Own work</span>