This entry presents Styrene (C8H8; CAS 100-42-5; PubChem CID 7501) as a 3D-printable ball-and-stick model in which every atom carries its engraved element symbol (C, H), 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.

Structure at a glance

• 16 atoms: 8 C, 8 H

• 16 bonds: 9 single, 1 double, 6 aromatic

• One aromatic 6-membered ring

• Functional group: one carbon-carbon double bond (C=C)

• No hydrogen-bond donors or acceptors (computed)

• No carbon atom is sp3-hybridised

Use in teaching

• Counting task: students tally the engraved symbols (8 C, 8 H; 16 atoms) and rebuild the formula C8H8 from the model alone.

• Aromaticity: identify the aromatic ring and the 6 bonds recorded as aromatic; the model draws them as one Kekulé structure (alternating single and double bonds), while in the real molecule they are delocalised, intermediate between single and double.

• Functional groups: find the carbon-carbon double bond (C=C) on the model and name it.

File and printing

STL mesh of 205,678 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: 5.617 × 5.895 × 4.943 Å; at scale factor 10 (1 Å to 10 mm, file read in millimetres) the print measures about 56.2 × 58.9 × 49.4 mm. SHA-256: 25f1baa0db06b243791d52b2d714b5ba89b54e73fcf021346aeb0b49b8e9603f.

Validation

• InChIKey identical to the PubChem record (PubChem FTP SDF, file dated 2026-10-08): PPBRXRYQALVLMV-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/100-42-5 · Licence and provenance record: molgod.org/licenses/stl/100-42-5 · Same file on Wikimedia Commons: File:Styrene-3D-molecular-model-engraved-CAS-100-42-5.stl

• MolGod ID: MG_699-410-893-27

• Wikidata: Q28917

• EC number: 202-851-5

• ChemSpider ID: 7220

• IUPAC name: styrene

• InChIKey: PPBRXRYQALVLMV-UHFFFAOYSA-N

• SMILES: C=CC1=CC=CC=C1

• Molar mass 104.15 g/mol (exact mass 104.062600255)

Licence: CC BY-SA 4.0 (licence text). Required attribution: "Styrene 3D model by MolGod.org — https://molgod.org/molecule/100-42-5/ — CC BY-SA 4.0".