Ammonia (CAS 7664-41-7): engraved ball-and-stick 3D molecular model (STL)
This entry presents Ammonia (H3N; CAS 7664-41-7; PubChem CID 222) as a 3D-printable ball-and-stick model in which every atom carries its engraved element symbol (H, N), so the model can be read without a colour key. Atomic coordinates come from the PubChem-computed 3D conformer (not an experimental crystal structure);...