Element Tungsten

Tungsten ElementA metallic element with the atomic symbol W, atomic number 74, and atomic weight 183.85.
The name tungsten comes from the former Swedish name for the tungstate mineral scheelite, tung sten or “heavy stone”
It is used in many manufacturing applications, including increasing the hardness, toughness, and tensile strength of steel; manufacture of filaments for incandescent light bulbs; and in contact points for automotive and electrical apparatus.
Element Tungsten is many alloys have numerous applications, including incandescent light bulb filaments, X-ray tubes (as both the filament and target), electrodes in gas tungsten arc welding, superalloys, and radiation shielding. Tungsten’s hardness and high density give it military applications in penetrating projectiles. Tungsten compounds are also often used as industrial catalysts.

Names and Identifiers

Chemical Formula:W
CAS:7440-33-7
Molecular Weight:183.84000 g/mol
EC Number :231-143-9
MDL Number:MFCD00011461
Color:grayish white, lustrous
Other Names:Wolframium, Tungsténe, Wolframio
PubChem CID:23964
IUPAC Name:Tungsten
Inchl:InChI=1S/W
InChI Key:WFKWXMTUELFFGS-UHFFFAOYSA-N
Canonical SMILES:[W]
ICSC Number:1404

Physical & Chemical Properties

Phase:Solid
Density:19.3 g/cm³
Boiling Point:6203 K ​(5930 °C, ​10706 °F)
Melting Point:3695 K ​(3422 °C, ​6192 °F)
Molecular Formula:W
Flash Point:-23ºC
Exact Mass:183.95100
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H228-H315-H319
Precautionary Statements:P210-P305 + P351 + P338
Hazard Codes:F:Flammable;Xi:Irritant;
Risk Phrases:R11;R36/38
Safety Phrases:S6-S26-S36
RIDADR:UN 3089
WGK Germany:n/a
RTECS:n/a
Packaging Group:II
Hazard Class:4.1

Tungsten isotopes are used in several applications. W-180 is used for the production of the therapeutic radioisotope W-181. W-186 is used for the production of W-188 which is used in so-called Tungsten-Rhenium generators. The W-188 daughter Re-188 is (milked( from there generators and used as a therapeutic radioisotope. W-184 has been used to study the elastic and inelastic scattering of heavy ions.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
180W179.946701 (5)0.12 (1)0
182W181.948202 (3)26.50 (16)0
183W182.950220 (3)14.31 (4)1/20.1177847
184W183.950928 (3)30.64 (2)0
186W185.954357 (4)28.43 (19)0

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
178W177.945921.6 dEC to 178Ta0
179W178.9470738 mEC to 179Ta7/2
181W180.94820121.2 dEC to 181Ta9/2
185W184.95342074.8 dβ to 185Re3/2
187W186.95715823.9 hβ to 187Re3/20.62
188W187.95848769.4 dβ to 188Re0

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