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Silicon

CAS: 7440-21-3 | Si

2D Structure

3D Structure

Loading 3D structure...

Basic Information

CAS Registry Number: 7440-21-3
Molecular Formula: Si
Molecular Weight: 28.086 g/mol

Names and Synonyms:

Silicon
KTC
Silicon
Silicon element
Sicomill Grade 2
KDB 20
Sicomill 4C-P
Silgrain Standard
SILSO
Polysilicon
HGH 600
Metasilicon 325A
Hexsil
CZ-N Polished wafer
SI 1059
GKO 3516A
KR 1
KDB 10
4FY
Silgrain HQ
Si(100) wafer
Biosilicon
Silgrain
Silicon 100
PHC 20
KDB 0.5
KDB 0.1
Aldrich 267414-25G
Sharp 80W
FEB 450D
JT 02
SIE 23PB
Sicomill E 4
PSi-C 2
ψ-C 2
SIE 20PB
KTC (element)
Silicon 600
SI 500443
SI 500444
KEF 100
AgroSilicio
Sili-K
Si-S 10μm
6PW-A1
Silicon 200
SI 500452
a-Si 11
a-Si 12
a-Si 13
M-Si 600
Silgrain E-Si 400
T 2
T 2 (filler)
SI 006031
WFP 6005
SAF 184
SI 100
KR-2
Wafer World 119
S 308

Identifiers:

SMILES:
[Si]
InChI:
InChI=1S/Si

Spectral Data

NMR, IR, and Mass spectral data

1H NMR
13C NMR
Predicting NMR spectra...
10 ppm 9 8 7 6 5 4 3 2 1 0 ppm
Shift (ppm) Multiplicity Integration Assignment
200 ppm 180 160 140 120 100 80 60 40 20 0 ppm
Shift (ppm) DEPT Assignment

Note: These NMR spectra are predicted computationally and may differ from experimental data. Predictions are based on chemical environment analysis.

External Resources

All Properties

Comprehensive physical and chemical properties

Physical Properties

Property Value Source
molecular_mass 28.09 g/mol Legacy Database
density 2.33 g/cm³ Legacy Database
cas-boiling-point 2355 °C None Legacy Database
cas-canonical-smile [Si] None Legacy Database
cas-density 2.33 g/cm3 @ Temp: 25 °C None Legacy Database
cas-inchi InChI=1S/Si None Legacy Database
cas-inchi-key InChIKey=XUIMIQQOPSSXEZ-UHFFFAOYSA-N None Legacy Database
cas-melting-point 1410 °C None Legacy Database
cas-name Silicon None Legacy Database
LogP -0.3808 RDKit

Molecular

Property Value Source
Molecular Weight 28.086 g/mol RDKit

Exact

Property Value Source
Exact Molecular Weight 27.97692653 g/mol RDKit

Heavy

Property Value Source
Heavy Atom Count 1 count RDKit

Hydrogen

Property Value Source
Hydrogen Bond Acceptors 0 count RDKit
Hydrogen Bond Donors 0 count RDKit

Rotatable

Property Value Source
Rotatable Bonds 0 count RDKit

Aromatic

Property Value Source
Aromatic Ring Count 0 count RDKit

Topological

Property Value Source
Topological Polar Surface Area 0.0 Ų RDKit

Molar

Property Value Source
Molar Refractivity 5.754 RDKit

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