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