Space-filling molecular models: Aromatic expansion set

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When we refer to "aromatic" compounds, it doesn't necessarily imply a pleasant scent (most do have a distinct smell, but like most chemicals you're not supposed to intentionally inhale them). "Aromatic" is chemspeak for certain flat, ring-shaped compounds with alternating double bonds. The double bonds exist outside the plane of the ring and interact in such a way that it's as if all the atoms are connected by one and a half bonds, resulting in a particularly stable compound. You usually see six-membered rings, most of them made of carbon. This also happens with five-membered rings, but at least one atom needs to be something other than carbon ("heterocyclic" in chemspeak). Frequently this is nitrogen, but other atoms can do this as well. To create six-membered aromatic rings, use CarbonPH6 and NitrogenPH1. To make five-membered rings use Carbon5PH1 and Nitrogen5PH1 (there's a "5" on these to help tell them from the six-membered ones). Usually nitrogen can't bond to atoms outside the ring because generally all three bonds are taken up to form the ring bonds. Occasionally this isn't the case. In that instance, use the appropriate carbon model and print it in your nitrogen color (they're the same size and shape). You often get two rings joined together; this allows the delocalized electrons to extend over both rings, resulting in a particularly stable molecule. Use CarbonJPH1 to join two six-membered rings. For even more complicated compounds you may need CarbonIPH1 as well because the double-carbon unit may not fit properly. To join a five and a six-membered ring together, use Carbon56PH2. You can have two joined five-membered rings, but they're rare and I didn't feel like doing it. See the starter set (http://www.thingiverse.com/thing:1720048), the carbon expansion set (http://www.thingiverse.com/thing:1730299), the nitrogen expansion pack (http://www.thingiverse.com/thing:1753583), halogen expansion set (http://www.thingiverse.com/thing:1730099), and the sulfur and phosphorous expansion set (http://thingaverse.com/thing:2350618) for more useful elements. Printer Settings Printer: Da Vinci 1A Rafts: Doesn't Matter Supports: Doesn't Matter Resolution: 0.2 mm Infill: 10% Notes: Three perimeters work well.