Overview Electron configuration. The electrons that determine valence – how an atom reacts chemically – are those with the highest energy. For a main-group element, the valence electrons are defined as those electrons residing in the electronic shell of highest principal quantum number n. The number that will give you an idea on the number of valence electrons is the Group number or the Family number. Let's say for example Group 1A, has 1 valence electron corresponding to the number of the group, Group 7A has 7 valence electron, Group 3B had 3 valence electron and so forth. In solid state electronics, either pure silicon or germanium may be used as the intrinsic semiconductor which forms the starting point for fabrication. Each has four valence electrons, but germanium will at a given temperature have more free electrons and a higher conductivity.Silicon is by far the more widely used semiconductor for electronics, partly because it can be used at much higher. The valence electrons are the outermost electrons, the ones in the shell of largest energy level. Orbitals hold 2 electrons each. There is an s orbital in every level n≥1.

Element Silicon - Si

Comprehensive data on the chemical element Silicon is provided on this page; including scores of properties, element names in many languages, most known nuclides of Silicon. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

Silicon Menu

• Silicon Page One
• Silicon Page Two
• Silicon Page Three

Overview of Silicon

• Atomic Number: 14
• Group: 14
• Period: 3
• Series: Metalloids (Nonmetal)

Silicon's Name in Other Languages

• Latin: Silicium
• Czech: Křemík
• Croatian: Silicij
• French: Silicium
• German: Silizium - r
• Italian: Silicio
• Norwegian: Silisium
• Portuguese: Silício
• Russian: Кремний
• Spanish: Silicio
• Swedish: Kisel

Atomic Structure of Silicon

• Atomic Radius: 1.46Å
• Atomic Volume: 12.1cm³/mol
• Covalent Radius: 1.11Å
• Cross Section (Thermal Neutron Capture) σ_a/barns: 0.171
• Crystal Structure: Cubic face centered
• Electron Configuration:

  1s² 2s²p⁶ 3s²p²

• Electrons per Energy Level: 2,8,4

  Shell Model
  

• Ionic Radius: 0.4Å
• Filling Orbital: 3p²
• Number of Electrons (with no charge): 14
• Number of Neutrons (most common/stable nuclide): 14
• Number of Protons: 14
• Oxidation States: 4
• Valence Electrons: 3s²p²

  Electron Dot Model
  

Chemical Properties of Silicon

• Electrochemical Equivalent: 0.26197g/amp-hr
• Electron Work Function: 4.52eV
• Electronegativity: 1.9 (Pauling); 1.74 (Allrod Rochow)
• Heat of Fusion: 50.55kJ/mol
• Incompatibilities:

  Chlorine, fluorine, oxidizers, calcium, cesium carbide, alkaline carbonates

• Ionization Potential
  • First: 8.151
  • Second: 16.345
  • Third: 33.492
• Valence Electron Potential (-eV): 144

Physical Properties of Silicon

• Atomic Mass Average: 28.0855
• Boiling Point: 2628K 2355°C 4271°F
• Coefficient of lineal thermal expansion/K^-1: 4.2E^-6
• Conductivity

  Electrical: 2.52E^-12 10⁶/cm Ω
  Thermal: 1.48 W/cmk

• Density: 2.33g/cc @ 300K
• Description:

  Hard dark gray non-metal.

• Elastic Modulus:
  • Bulk: 100/GPa
  • Youngs: 47/GPa
• Enthalpy of Atomization: 439.3 kJ/mole @ 25°C
• Enthalpy of Fusion: 46.44 kJ/mole
• Enthalpy of Vaporization: 439 kJ/mole
• Flammablity Class: Combustible Solid in powder form
• Freezing Point:see melting point
• Hardness Scale
  • Mohs: 6.5
• Heat of Vaporization: 384.22kJ/mol
• Melting Point: 1683K 1410°C 2570°F
• Molar Volume: 12.05 cm³/mole
• Optical Reflectivity: 28%
• Physical State (at 20°C & 1atm): Solid
• Specific Heat: 0.71J/gK
• Vapor Pressure = 4.77@1410°C

Regulatory / Health

• CAS Number
  • 7440-21-3 amorphous powder
• UN/NA ID and ERG Guide Number
  • 1346 / 170 amorphous powder
• RTECS: VW0400000
• OSHAPermissible Exposure Limit (PEL)
  • TWA: 15 mg/m³ total particulate

    5 mg/m³ respirable particulate

• OSHA PEL Vacated 1989
  • TWA: 10 mg/m³ total particulate

    5 mg/m³ respirable particulate

• NIOSHRecommended Exposure Limit (REL)
  • TWA: 10 mg/m³ total particulate

    5 mg/m³ respirable particulate

• Routes of Exposure: Inhalation; Ingestion; Skin and/or eye contact
• Target Organs: Eyes, skin, respiratory system
• Levels In Humans:
  Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
  • Blood/mg dm^-3: 3.9
  • Bone/p.p.m: 17
  • Liver/p.p.m: 12-120
  • Muscle/p.p.m: 100-200
  • Daily Dietary Intake: 18-1200 mg
  • Total Mass In Avg. 70kg human: 1 g

Who / Where / When / How

• Discoverer: Jöns J. Berzelius
• Discovery Location: Stockholm Sweden
• Discovery Year: 1824
• Name Origin:

  Latin: silex (flint).

• Abundance of Silicon:
  • Earth's Crust/p.p.m.: 277100
  • Seawater/p.p.m.:
    • Atlantic Suface: 0.03
    • Atlantic Deep: 0.82
    • Pacific Surface: 0.03
    • Pacific Deep: 4.09
  • Atmosphere/p.p.m.: N/A
  • Sun (Relative to H=1E¹²): 4.47E+07
• Sources of Silicon:

  Silicon is the second most abundant element and comprises 25% of the earth's crust. Makes up major portion of clay, granite, quartz (SiO₂), and sand. Approximate annual world production wide production: electronics grade pure silicon, 5000 tons; metallurgical grade, 480,000 tons; ferrosilicon, 3,400,000. Primary mining areas are Austria, Italy, India, South Africa, Australia, Canada, USA, Brazil.

• Uses of Silicon:

  Used in glass as silicon dioxide (SiO₂). It is used as a semiconductor to make microchips for electronics (like your computer). Silicon is also used in solar cells, tools, cement, grease and oils.

• Additional Notes:

  Silicon carbide (SiC) is one of the hardest substances known.

Silicon Menu

• Silicon Page One
• Silicon Page Two
• Silicon Page Three

References

A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

Related Resources

• Anatomy of the Atom
  Answers many questions regarding the structure of atoms.
• Molarity, Molality and Normality
  Introduces stoichiometry and explains the differences between molarity, molality and normality.
• Molar Mass Calculations and Javascript Calculator
  Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
• Chemical Database
  This database focuses on the most common chemical compounds used in the home and industry.

Citing this page

If you need to cite this page, you can copy this text:

Kenneth Barbalace. Periodic Table of Elements - Silicon - Si. EnvironmentalChemistry.com. 1995 - 2021. Accessed on-line: 4/25/2021
https://EnvironmentalChemistry.com/yogi/periodic/Si.html
.

Linking to this page

If you would like to link to this page from your website, blog, etc., copy and paste this link code (in red) and modify it to suit your needs:

<a href='https://EnvironmentalChemistry.com/yogi/periodic/Si.html'>echo Periodic Table of Elements: Silicon - Si (EnvironmentalChemistry.com)</a>- Comprehensive information for the element Silicon - Si is provided by this page including scores of properties, element names in many languages, most known nuclides and technical terms are linked to their definitions.
.

NOTICE: While linking to articles is encouraged, OUR ARTICLES MAY NOT BE COPIED TO OR REPUBLISHED ON ANOTHER WEBSITE UNDER ANY CIRCUMSTANCES.

No Of Valence Electrons In Silicon

PLEASE, if you like an article we published simply link to it on our website do not republish it.