• Selenide Valence Electrons
• Neutral Selenium Valence Electrons

Element Selenium - Se

• Each sub-shell accommodates a certain number of electrons. Sub-shells s, p, d and f hold a maximum of two, six, 10 and 14 electrons, respectively. In selenium, the first energy level has two electrons in sub-shell s. The second energy level holds eight electrons. Two of those electrons are in sub-shell s, while the other six are found in sub.
• Mar 26, 2020 Sub-shells s, p, d and f hold a maximum of two, six, 10 and 14 electrons, respectively. In selenium, the first energy level has two electrons in sub-shell s. The second energy level holds eight electrons. Two of those electrons are in sub-shell s, while the other six are found in sub-shell p.
• Sulfur has been known since antiquity, and oxygen was recognized as an element in the 18th century. Selenium, tellurium and polonium were discovered in the 19th century, and livermorium in 2000. All of the chalcogens have six valence electrons, leaving them two electrons short of a full outer.

Comprehensive data on the chemical element Selenium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Selenium. 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.

Valence electrons of selenium will be placed in s and p-orbitals. Explanation: Valence electrons are defined as the electrons present in the last shell of any element. 34 configuration - 3d10 4s2 4p4 orbital = 3rd orbital. Mar 22, 2019 We know that the atomic number of selenium is 34.So selenium has 34 protons and 34 electrons as the charge of electrons and protons are equal but opposite in nature.The charge of proton is +1 and the charge of electron is -1. Step-3: Now write the electron configuration of selenium. Se (34)=1s²2s²2p⁶3s²3p⁶4s²3d¹º4p⁴.

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Overview of Selenium

• Atomic Number: 34
• Group: 16
• Period: 4
• Series: Nonmetals

Selenium's Name in Other Languages

• Latin: Selenium
• Czech: Selen
• Croatian: Selenij
• French: Sélénium
• German: Selen - r
• Italian: Selenio
• Norwegian: Selen
• Portuguese: Selênio
• Russian: Селен
• Spanish: Selenio
• Swedish: Selen

Atomic Structure of Selenium

• Atomic Radius: 1.22Å
• Atomic Volume: 16.45cm³/mol
• Covalent Radius: 1.16Å
• Cross Section (Thermal Neutron Capture) σ_a/barns: 11.7
• Crystal Structure: Hexagonal
• Electron Configuration:

  1s² 2s²p⁶ 3s²p⁶d¹⁰ 4s²p⁴

• Electrons per Energy Level: 2,8,18,6

  Shell Model
  

• Ionic Radius: 0.5Å
• Filling Orbital: 4p⁴
• Number of Electrons (with no charge): 34
• Number of Neutrons (most common/stable nuclide): 45
• Number of Protons: 34
• Oxidation States: ±2,4,6
• Valence Electrons: 4s²p⁴

  Electron Dot Model
  

Chemical Properties of Selenium

• Electrochemical Equivalent: 0.7365g/amp-hr
• Electron Work Function: 5.9eV
• Electronegativity: 2.55 (Pauling); 2.48 (Allrod Rochow)
• Heat of Fusion: 6.694kJ/mol
• Incompatibilities:

  Acids, strong oxidizers, chromium trioxide, potassium bromate, cadmium

• Ionization Potential
  • First: 9.752
  • Second: 21.19
  • Third: 30.82
• Valence Electron Potential (-eV): 120

Physical Properties of Selenium

• Atomic Mass Average: 78.96
• Boiling Point: 958K 685°C 1265°F
• Coefficient of lineal thermal expansion/K^-1: 36.9E^-6
• Conductivity

  Electrical: 1.0E^-12 10⁶/cm Ω
  Thermal: 0.0204 W/cmk

• Density: 4.79g/cc @ 300K
• Description:

  Dark gray lustrous rods or dark red crystals of non-metal. Burns in contact with air but is unaffected by water. Disolves in alkalis and concentrated HNO₃.

• Elastic Modulus:
  • Bulk: 8.3/GPa
  • Rigidity: 3.7/GPa
  • Youngs: 58/GPa
• Enthalpy of Atomization: 205.9 kJ/mole @ 25°C
• Enthalpy of Fusion: 6.69 kJ/mole
• Enthalpy of Vaporization: 26.3 kJ/mole
• Flammablity Class: Combustible Solid
• Freezing Point:see melting point
• Hardness Scale
  • Brinell: 736 MN m^-2
  • Mohs: 2
• Heat of Vaporization: 37.7kJ/mol
• Melting Point: 494K 221°C 430°F
• Molar Volume: 16.42 cm³/mole
• Optical Refractive Index: 1.000895
• Physical State (at 20°C & 1atm): Solid
• Specific Heat: 0.32J/gK
• Vapor Pressure = 0.695Pa@221°C

Regulatory / Health

• CAS Number
  • 7782-49-2 powder
• UN/NA ID and ERG Guide Number
  • 2658 / 152 powder
• RTECS: VS7700000
• OSHAPermissible Exposure Limit (PEL)
  • TWA: 0.2 mg/m³
• OSHA PEL Vacated 1989
  • TWA: 0.2 mg/m³
• NIOSHRecommended Exposure Limit (REL)
  • TWA: 0.2 mg/m³
  • IDLH: 1 mg/m³
• Routes of Exposure: Inhalation; Ingestion; Skin and/or eye contact
• Target Organs: Eyes, skin, respiratory system, liver, kidneys, blood, spleen
• 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: 0.171
  • Bone/p.p.m: 1-9
  • Liver/p.p.m: 0.35-2.4
  • Muscle/p.p.m: 0.42-1.9
  • Daily Dietary Intake: 0.006-0.2 mg
  • Total Mass In Avg. 70kg human: 10-65 mg

Who / Where / When / How

• Discoverer: Jöns J. Berzelius
• Discovery Location: Stockholm Sweden
• Discovery Year: 1817
• Name Origin:

  Greek: Selênê (Moon)

• Abundance of Selenium:
  • Earth's Crust/p.p.m.: 0.05
  • Seawater/p.p.m.:
    • Atlantic Suface: 4.6E-08
    • Atlantic Deep: 1.8E-07
    • Pacific Surface: 1.5E-08
    • Pacific Deep: 1.65E-07
  • Atmosphere/p.p.m.: N/A
  • Sun (Relative to H=1E¹²): N/A
• Sources of Selenium:

  Obtained as a by-product of lead, copper and nickel refining. World wide annual production is around 600 tons. Primary mining areas are Canada, USA, Bolivia and Russia.

• Uses of Selenium:

  Used in photoelectric cells, TV cameras, as a semiconductor in solar batteries, light meters, copy machines, anti-dandruff shampoo and rectifiers. Also colors glass red.

• Additional Notes:

  A dose of selenium as small as 5 mg per day can be lethal for many humans.

Selenide Valence Electrons

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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.

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Neutral Selenium Valence Electrons

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