Chemical properties, health and environmental effects of tungsten. Electronegativity accoridin to Pauling. In 1969, after evaluating the uncertainties associated with the mass-spectrometric measurements, the Commission assigned a value of A r (W) = 183.85(3). For a number of years after that, in the absence of calibrated mass-spectrometric measurements, the Commission was concerned about a discrepancy between the recommended atomic weight and the results of earlier chemical determinations that. Tungsten (W), with a mass number of 185 and an atomic number of 74, decays by beta emission. Identify the product of the nuclear reaction by providing its atomic symbol (5 pts), mass number (5 pts), and atomic number (5 pts).
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 Plaster format.
- 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
![Atomic Number Of Tungsten Atomic Number Of Tungsten](/uploads/1/3/4/8/134891838/267588376.jpg)
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
Atomic Number Of Tungsten 183
- 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
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
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
TWA: 5 mg/m3
STEL: 10 mg/m3
Routes of Exposure:
Effective Atomic Number Of Tungsten
- Inhalation
- Ingestion
- Skin and/or eye contact
Target Organs:
Atomic Number Of Tungsten Cost
- Eyes
- Skin
- Respiratory system
- Blood
. . .
Tungsten Mass Number
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