Silicon

CAS 7440-21-3  ·  Si  ·  MW 28.085 g/mol

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3D model Silicon, CAS 7440-21-3, molecular formula Si, molar mass 28.085 g/mol

Model views

  • Silicon (CAS 7440-21-3) – ball-and-stick 3D model, MolGod Viewer
    ball-and-stick 3D model
  • Silicon (CAS 7440-21-3) – skeletal 3D model, MolGod Viewer
    skeletal 3D model
  • Silicon (CAS 7440-21-3) – space-filling 3D model, MolGod Viewer
    space-filling 3D model
  • Silicon (CAS 7440-21-3) – 2D structure, MolGod Viewer
    2D structure

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About Silicon

Silicon is a chemical compound registered under number CAS 7440-21-3, with the molecular formula Si, and a molar mass of 28.085 g/mol.

The molecule contains 1 atoms connected by 0 chemical bonds. The interactive 3D model above lets you view the spatial arrangement of the atoms — you can rotate it with the mouse, zoom with the scroll wheel, and switch between skeletal / Ball & Stick / Space Fill visualization modes.

In terms of physicochemical properties, polar surface area PSA = 0 Ų, 0 donors and 0 hydrogen bond acceptors. These parameters are key when assessing bioavailability and interaction with biomolecules.

Chemical data for this compound comes from PubChem (NIH NLM NCBI), one of the world's largest chemical databases. All information is updated automatically and enriched with GHS hazard statement translations compliant with the CLP Regulation (EC 1272/2008). The interactive 3D model and the viewer images are protected by copyright (© MolGod.org) — terms of use: molgod.org/copyright/.

Physicochemical properties
Molecular formulaSi
Molar mass28.085 g/mol
IUPAC—
SMILES[Si]
InChIKeyXUIMIQQOPSSXEZ-UHFFFAOYSA-N
logP (XLogP3)—
PSA0 Ų
HBD / HBA0 / 0
PubChem CIDCID 5461123 ↗
GHS safety

Signal word: Danger

GHS02
GHS02

H228 — Flammable solid

H320 — Causes eye irritation

Scientific literature

Related literature

7 articles · 5 open access · Sources: PubMed, OpenAlex, Semantic Scholar

Filters:Export:📄 BibTeX📑 RIS📋 EndNote🔧 CSL-JSON

Data from PubMed (NIH NLM), OpenAlex (CC0), Semantic Scholar (AI2). AI Summary generated by Semantic Scholar TLDR. Articles marked with require paid access.

Synonyms
SILICON · 7440-21-3 · Silicon metal · Defoamer S-10 · Silicon, elemental · Silicium · Z4152N8IUI · CHEBI:27573 · Silicon 28 · Elemental silicon · Meteorite · Silicium Metallicum · Meteorite 8133 · RefChem:6220 · DTXCID5030038
Data sources
Related molecules
📜 License & provenancePREDICTED MODEL · NOT VERIFIEDMolGod_License_1
PREDICTED MODEL — NOT VERIFIED
computed by MolGod Scientific · experimental feature (beta) · may contain errors

No source 3-D conformer was available to MolGod for this substance. MolGod Scientific computed this geometry from the structural formula with RDKit 2026.03.6 (no conformer embedding or force-field optimisation was needed: the substance consists of single-atom ions only, whose arrangement is a presentation convention). It is not a measured structure, it does not come from PubChem, and it has not been compared with experimental data. It shows one possible conformation.

Methods and references
  1. RDKit: Open-source cheminformatics, version 2026.03.6. Zenodo. doi:10.5281/zenodo.22140358 (all versions: doi:10.5281/zenodo.591637)
  2. Heller SR, McNaught A, Pletnev I, Stein S, Tchekhovskoi D. InChI, the IUPAC International Chemical Identifier. J. Cheminform. 2015, 7, 23. doi:10.1186/s13321-015-0068-4
  3. Kim S, Chen J, Cheng T, et al. PubChem 2025 update. Nucleic Acids Res. 2025, 53, D1516-D1525. doi:10.1093/nar/gkae1059 Compound record: https://pubchem.ncbi.nlm.nih.gov/compound/5461123
  4. Bolton EE, Kim S, Bryant SH. PubChem3D: Conformer generation. J. Cheminform. 2011, 3, 4. doi:10.1186/1758-2946-3-4 (cited for contrast: no source 3-D conformer was available to MolGod for this record)

MG-STL-7440-21-3-ENGRAVED

Silicon (CAS 7440-21-3), Si - 3D ball-and-stick molecular model, MolGod STL previewDownload image

MG-STL-7440-21-3-NORMAL · 320 △ · 16 KB · SHA-256 1ea8a62845b30fa3

Download 3D model

Model
Silicon · 7440-21-3
InChIKey
XUIMIQQOPSSXEZ-UHFFFAOYSA-N
License
CC BY-SA 4.0 International (source rights undetermined — not yet granted)
Attribution
MolGod Scientific — Silicon (CAS 7440-21-3)
License & provenance record
Silicon (CAS 7440-21-3) →
MolGod molecule record
Silicon →
Source data
PubChem CID 5461123 ↗
Model information
STL generated by MolGod · MolGod STL Exporter build 48804cd20b0d · generated 2026-10-15
SHA-256 (STL)
1ea8a62845b30fa3e45df39bba7e6c7497cb287b08dd4427310d5e3de0ce3a26
MD5 (STL)
c03c324325efeac00a641c1792413ce6
Model identifier
MG-STL-7440-21-3
Transformation
MolGod Scientific ball-and-stick mesh
Changes
PREDICTED geometry computed by MolGod Scientific (RDKit), NOT verified; rendered as a triangulated mesh.
Wikimedia Commons
not published yet

This license applies to the MolGod-created STL mesh, not automatically to third-party source material.

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