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CAS No 7439-98-7 , molybdenum

  • Name: molybdenum
  • Synonyms: metallic; MChVL; Molybdenum(6+); Metco 63;molybdenum; elemental; (99mo)molybdenum; MOLYBDENUM(VI) ION; Molybdenum;7439-98-7;
  • CAS Registry Number:
  • Transport: UN 3264 8/PG 3
  • Melting Point: 2622 °C
  • Boiling Point: 4825 °C
  • Density: 10.3 g/mL at 25 °C(lit.)
  • Water Solubility: H2O: soluble
  • Safety Statements: R36/37/38:Irritatingtoeyes,respiratorysystemandskin.;
  • Hazard Symbols: Xi:Irritant;
  • EINECS: 231-107-2
  • Molecular Weight: 95.96
  • InchiKey: ZOKXTWBITQBERF-UHFFFAOYSA-N
  • InChI: InChI=1S/Mo
  • Risk Statements: S24/25:Avoidcontactwithskinandeyes.;
  • Molecular Formula: Mo
  • Molecular Structure:CAS No:7439-98-7 molybdenum
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7439-98-7 Molybdenum atomic absorption standard solution

  • Hong kong ADVANCED TECH. & IND. CO., LTD. [Distributor/Wholesaler]
  • Tel: 86-23902293
  • Fax: 86-27898314
  • Address: UNIT B, 1/F, CHEONG SHING IND. BLDG., 17 WALNUT ST., TAI KOK TSUI, KLN, HONG KONG Hong Kong,nilHong kong
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7439-98-7 Molybdenum Powder

  • China Ruiyuan Group Limited [Manufacturers]
  • Tel: +86-21-50456736
  • Fax: +86-21-60853441
  • Address: No.188, Zhangyang Road, Pudong, Shanghai 200122, ,China
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7439-98-7 (0957) MOLYBDENUM

  • Germany Fox Chemicals GmbH [Manufacturer]
  • Tel: +49.7240.927151/ +49.160.95781845 (Mobile)
  • Fax: +49.7240.927150
  • Address: Fox Chemicals GmbH
    Bockstalstr.10 A
    D-76327 Pfinztal-Germany ,Germany
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7439-98-7 Molybdenum

  • India Triveni Chemicals []
  • Tel: +91-(260)-2400022, 3258683
  • Fax: +91-(260)-2400022/3264008
  • Address: 135, Pancharatna, Char Rasta, G.I.D.C., Vapi, Gujarat 396 195, ,India
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7439-98-7 Ferromolybdenum

  • United States GFS Chemicals, Inc. [Manufacturer]
  • Tel: 800-858-9682/ 740-881-5501
  • Fax: 740-881-5989
  • Address: GFS Chemicals, Inc.
    P.O. Box 245
    Powell, OH 43065 ,United States
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7439-98-7 Ferromolybdenum

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7439-98-7 MOLYBDENUM

  • Germany Cfm Oskar Tropitzsch [Manufacturer]
  • Tel: +49-9231-9619-0
  • Fax: +49-9231-9619-60
  • Address: Cfm Oskar Tropitzsch
    Waldershofer Str. 49-51
    95615 Marktredwitz
    Germany ,Germany
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7439-98-7 MOLYBDENUM METAL

  • United States Noah Technologies Corp. [Manufacturer]
  • Tel: 210-691-2000
  • Fax: 210-691-2600
  • Address: 1 Noah Park
    San Antonio, TX 78249-3419 ,United States
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7439-98-7 SS-340-2X1/4 MOLYBDENUM

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7439-98-7 MOLYBDENUM METAL POWDER 3.5-4.5M; 99.95%

  • Germany ABCR GmbH & Co KG [Manufacturer]
  • Tel: +49 721 95061-0
  • Fax: +49 721 95061-80
  • Address: Im Schlehert 10
    76187 Karlsruhe
    Germany ,Germany
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References of molybdenum
Title: Molybdenum
CAS Registry Number: 7439-98-7
Literature References: Mo; at. wt 95.94; at. no. 42; valences 2,3,4,5,6. Group VIB (6). Naturally occurring isotopes: 98 (23.75%); 96 (16.5%); 95 (15.7%); 92 (15.86%); 94 (9.12%); 100 (9.62%); 97 (9.45%); artificial radioactive isotopes: 88-91; 93; 99; 101-105. Its most important ores are molybdenite, MoS2, and wulfenite, PbMoO4. Occurrence in the earth's crust: 1-1.5 ppm. Discovered in 1778 by Scheele; isolated in 1782 by Hjelm. Methods of preparation: L. Northcott, Molybdenum (Academic Press, New York, 1956) 222 pp; Hein, Herzog, in Handbook of Preparative Inorganic Chemistry vol. 2, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) pp 1401-1402. Important trace element; participates in biochemical redox reactions such as N2-fixation: Spence, Coord. Chem. Rev. 4, 475 (1969). Physical properties: Worthing, Phys. Rev. [2] 25, 846 (1925); D. R. Stoll, G. C. Sinke, Thermodynamic Properties of the Elements, Advances in Chemistry Series 18, (American Chemical Society, Washington, 1956) pp 23, 130-131. Review of molybdenum and its compds: Rollinson, "Chromium, Molybdenum and Tungsten" in Comprehensive Inorganic Chemistry vol. 3, J. C. Bailar Jr. et al., Eds. (Pergamon Press, Oxford, 1973) pp 622-623, 700-742; R. Q. Barr in Kirk-Othmer Encyclopedia of Chemical Technology vol. 15 (Wiley-Interscience, New York, 3rd ed., 1981) pp 670-682. Biochemical review: Bioinorg. Chem. II, K. N. Raymond, Ed. (A.C.S., Washington, 1977) pp 353-430. Symposium on the chemistry and uses of molybdenum and its cmpds: Polyhedron 5, 1-606 (1986).
Properties: Dark-gray or black powder with metallic luster or coherent mass of silver-white color; body-centered cubic structure. mp 2622° (Worthing). bp ~4825°. d 10.28. Spec heat 5.68 cal/g-atom/deg; heat of fusion: 6.6 kcal/g-atom; heat of vaporization: 142 kcal/g-atom (Stoll, Sinke). Fairly stable at ordinary temp; oxidized to the trioxide at a red heat; slowly oxidized by steam. Not attacked by water, by dil acids or by concd hydrochloric acid. Practically insol in alkali hydroxides or fused alkalies. Reacts with nitric acid, hot concd sulfuric acid, fused potassium chlorate or nitrate. Attacked by fluorine at ordinary temp, by chlorine or bromine at a red heat.
Melting point: mp 2622° (Worthing)
Boiling point: bp ~4825°
Density: d 10.28
CAUTION: Potential symptoms of overexposure to Mo metal in exptl animals are irritation of eyes, nose, throat; anorexia, diarrhea, weight loss; listlessness; liver and kidney damage. Potential symptoms of overexposure to soluble Mo compds in exptl animals are irritation of eyes, nose, throat; anorexia; incoordination; dyspnea, anemia. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 218.
Use: In the form of ferromolybdenum for manufg special steels for tools, boiler plate, rifle barrels, propeller shafts; electrical contacts, spark plugs, x-ray tubes, filaments, screens and grids for radio tubes; in the production of tungsten; glass-to-metal seals; nonferrous alloys; in colloidal form as lubricant additive.