Element Silicon

Silicon ElementIt is a chemical element with the symbol Si and atomic number 14.
It is a hard and brittle crystalline solid with a blue-grey metallic lustre; and it is a tetravalent metalloid and semiconductor.
Element Silicon is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, and lead are below it

Names and Identifiers

Chemical Formula:Si
CAS:7440-21-3
Molecular Weight:28.09000 g/mol
EC Number :231-130-8
MDL Number:MFCD00085311
Color:dark gray with a bluish tinge
Other Names:Silicium, Silicio
PubChem CID:5461123
IUPAC Name:Silicon
Inchl:InChI=1S/Si
InChI Key:XUIMIQQOPSSXEZ-UHFFFAOYSA-N
Canonical SMILES:[Si]
ICSC Number:1508

Physical & Chemical Properties

Phase:Solid
Density:2.3290 g/cm³
Boiling Point:3538 K ​(3265 °C, ​5909 °F)
Melting Point:1687 K ​(1414 °C, ​2577 °F)
Molecular Formula:Si
Flash Point:n/a
Exact Mass:27.98000
Symbol:Globally Harmonized System of Classification
Signal Word:Warning
Hazard Statements:H228
Precautionary Statements:P210
Hazard Codes:F:Flammable
Risk Phrases:R11
Safety Phrases:S16-S33-S7/9
RIDADR:UN 2922 8/PG 2
WGK Germany:2
RTECS:VW0400000
Packaging Group:III
Hazard Class:4.1

Naturally occurring silicon is composed of three stable isotopes, 28Si (92.23%), 29Si (4.67%), and 30Si (3.10%).

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
28Si27.9769271 (7)92.2297 (7)00
29Si28.9764949 (7)4.6832 (5)1/2-0.55529
30Si29.9737707 (7)3.0872 (5)00

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
26Si25.9923302.23 sEC to 26Al0
27Si26.98670414.14 sEC to 27Al5/2
31Si30.9753622.62 hβ to 31P3/2
32Si31.974148160 yβ to 32P0
33Si32.978006.1 sβ to 33P3/2
34Si33.978582.8 sβ to 34P0

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