Description

This entry presents 1,2-Dichloroethane (C2H4Cl2; CAS 107-06-2; PubChem CID 11 (https://pubchem.ncbi.nlm.nih.gov/compound/11)) as a 3D-printable ball-and-stick model in which every atom carries its engraved element symbol (C, H, Cl), so the model can be read without a colour key. Atomic coordinates come from the PubChem-computed 3D conformer (not an experimental crystal structure); coordinates and connectivity are unchanged. Unlike 3DPX-001225 (https://3d.nih.gov/entries/3DPX-001225), this model is engraved for colour-independent reading in the classroom. Biological relevance: 1,2-Dichloroethane is recorded as an occupational carcinogen (source: Wikidata Q161480 (https://www.wikidata.org/wiki/Q161480), retrieved 2026-10-10). Structure at a glance 8 atoms: 2 C, 4 H, 2 Cl 7 bonds, all single No rings (open-chain structure) Functional groups: two C-Cl bonds No hydrogen-bond donors or acceptors (computed) Every carbon atom is sp3-hybridised (tetrahedral) Use in teaching Counting task: students tally the engraved symbols (2 C, 4 H, 2 Cl; 8 atoms) and rebuild the formula C2H4Cl2 from the model alone. Functional groups: find the two C-Cl bonds on the model and name each one. File and printing STL mesh of 99,132 triangles, a closed (watertight) single solid. Coordinates are in ångström and STL stores no unit, so scale the model deliberately in your slicer. Measured bounding box: 3.499 × 3.947 × 3.203 Å; at scale factor 10 (1 Å to 10 mm, file read in millimetres) the print measures about 35.0 × 39.5 × 32.0 mm. SHA-256: 2e36436dc463756f1e5d0ce3a964c50db6e16e05b845fe9871c89daa23540a46. Validation InChIKey identical to the PubChem record (PubChem FTP SDF, file dated 2026-10-08): WSLDOOZREJYCGB-UHFFFAOYSA-N Molecular formula and hydrogen-bond donor/acceptor counts identical to PubChem Mesh: triangle count in the header equals the actual count; 0 edges not shared by exactly two triangles; 1 connected solid; SHA-256 equal to the published file Source, licence and identifiers Full record: molgod.org/molecule/107-06-2 (https://molgod.org/molecule/107-06-2/?utm_source=nih3d&utm_medium=referral&utm_campaign=edu-3d-models) · Licence and provenance record: molgod.org/licenses/stl/107-06-2 (https://molgod.org/licenses/stl/107-06-2/) · Same file on Wikimedia Commons: File:1,2-Dichloroethane-3D-molecular-model-engraved-CAS-107-06-2.stl (https://commons.wikimedia.org/wiki/File:1,2-Dichloroethane-3D-molecular-model-engraved-CAS-107-06-2.stl) MolGod ID: MG_105-569-074-10 (https://molgod.org/id/MG_105-569-074-10) Wikidata: Q161480 (https://www.wikidata.org/wiki/Q161480) EC number: 203-458-1 ChemSpider ID: 13837650 IUPAC name: 1,2-dichloroethane InChIKey: WSLDOOZREJYCGB-UHFFFAOYSA-N SMILES: C(CCl)Cl Molar mass 98.96 g/mol (exact mass 97.9690055) Licence: CC BY-SA 4.0 (licence text (https://creativecommons.org/licenses/by-sa/4.0/)). Required attribution: "1,2-Dichloroethane 3D model by MolGod.org — https://molgod.org/molecule/107-06-2/ — CC BY-SA 4.0".