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Tungsten Atomic Structure:

  • Atomic Radius: 2.02Å
  • Atomic Volume: 9.53cm3/mol
  • Covalent Radius: 1.3Å
  • Cross Section: 18.5barns ±0.5
  • Crystal Structure: Body centered cube

Tungsten Electron Configuration:

1s2 2s2p6 3s2p6d10 4s2p6d10f14 5s2p6d4 6s2

  • Electrons per Energy Level: 2, 8, 18, 32, 12, 2
  • Ionic Radius: 0.62Å
  • Filling Orbital: 5d4
  • Number of Electrons (with no charge): 74
  • Number of Neutrons (most common/stable nuclide): 110
  • Number of Protons: 74
  • Oxidation States: 6, 5, 4, 3, 2
  • Valance Electrons: 5d4 6s2

Tungsten Chemical Properties:

  • Electrochemical Equivalent: 1.1432g/amp-hr
  • Electron Work Function: 4.55eV
  • Electronegativity (Pauling): 2.36
  • Heat of Fusion: 35.4kJ/mol

Incompatibilities:

  • Bromine trifluoride, chlorine trifluoride, fluorine, iodine pentafluoride
  • Ionization Potential
  • First: 7.98
  • Valance Electron Potential (-eV): 140

Tungsten Physical Properties:

  • Atomic Mass Average: 183.85
  • Boiling Point: 5928K 5655°C 10211°F
  • Coefficient of lineal thermal expansion: 0.0000046cm/cm/°C (0°C)

Conductivity

  • Electrical: 0.189 106/cm
  • Thermal: 1.74 W/cmK
  • Density: 19.35g/cc @ 300K
  • Elastic Modulus:
  • Bulk: 310/GPa
  • Rigidity: 161/GPa
  • Youngs: 411/GPa
  • Enthalpy of Atomization: 837 kJ/mole @ 25°C
  • Enthalpy of Fusion: 35.23 kJ/mole
  • Enthalpy of Vaporization: 799.1 kJ/mole
  • Flammability Class: Combustible
  • Freezing Point: 3680K 3407°C 6165°F

Hardness Scale

  • Brinell: 2570 MN m-2
  • Mohs: 7.5
  • Vickers: 3430 MN m-2

  • Heat of Vaporization: 824kJ/mol
  • Melting Point: 3680K 3407°C 6165°F

  • Molar Volume: 9.5 cm3/mole
  • Optical Reflectivity: 62%
  • Physical State (at 20°C & 1atm): Solid
  • Specific Heat: 0.13J/gK
  • Vapor Pressure = 4.27Pa@3407°C

Regulatory / Health

CAS Number
7440-33-7

RTECS: Y07175000

OSHA Permissible Exposure Limit (PEL)
No limits set by OSHA
OSHA PEL Vacated 1989
TWA: 5 mg/m3
STEL: 10 mg/m3

NIOSH Recommended Exposure Limit (REL)
TWA: 5 mg/m3
STEL: 10 mg/m3

Routes of Exposure:

  • Inhalation
  • Ingestion
  • Skin and/or eye contact

Target Organs:

  • Eyes
  • Skin
  • Respiratory system
  • Blood

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