Molybdenum
This presentation is the property of its rightful owner.
Sponsored Links
1 / 6

Molybdenum PowerPoint PPT Presentation


  • 80 Views
  • Uploaded on
  • Presentation posted in: General

Molybdenum. By: Mikaela DeBari & Austin King. Chemical Properties. Atomic number: 42 Atomic mass: 95.94g.mol-1 Electro negativity: 1.8 Density: 10.2g.cm-3 at 20 degrees C Melting point: 2610 degrees C Boiling point: 4825 degrees C Vanderwaals radius: 0.139 nm

Download Presentation

Molybdenum

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Molybdenum

Molybdenum

By: Mikaela DeBari & Austin King


Chemical properties

Chemical Properties

  • Atomic number: 42

  • Atomic mass: 95.94g.mol-1

  • Electro negativity: 1.8

  • Density: 10.2g.cm-3 at 20 degrees C

  • Melting point: 2610 degrees C

  • Boiling point: 4825 degrees C

  • Vanderwaals radius: 0.139 nm

  • Ionic radius: 0.068nm(+4) ; 0.06(+6)

  • Isotopes: 11

  • Electronic Shell: [ Kr ] 4d^5 5s^1

  • Energy of first ionization: 651 kJ.mol^-2

  • Discovered by Carl Wilhelm Scheele in 1778


Physical properties

Physical Properties

  • This metal is a silvery white, very hard transition metal.

  • It was often confused with graphite and lead ore

  • Its melting point is higher than most pure elements, besides tungsten and tantalum

  • Oxidizes at elevated temperatures .


Application

Application

  • Molybdenum is used as an alloy agent and is valuable because it contributes to the toughness of quenched and tempered steels.

  • It can also be used to improve the strength of steel at higher temperatures.

  • It is used in nickel-based alloys, such as the “Hastelloys(R)” which are heat resistent and corrosion resistant to chemical solutions

  • There is a recent application for molybdenum as electrodes for electrically heated glass furnaces and foreheaths.

  • Used in nuclear energy applications and for missile and aircraft parts.

  • Can also be used as a lubricant at high heats where oils would decompose.


Environmental use

Environmental Use

  • Molybdenum is less soluble in acidic soils and more soluble in alkaline soils, so it is more available for plants with sensativity to pH and drainage conditions.

  • Environmental Effects:

    • Molybdenum is essential to all species, but is only essential in small amounts, in large amounts it is highly toxic.

    • Too much molybdenum can cause fetal deformities


Health effects

Health effects

  • Molybdenum is a highly toxic metal.

  • Liver dysfunction with hyperbilirubinemia was reported in workmen who were exposed to Mo-Cu plant.

  • Has caused gout in factory workers and in Mo- rich areas of Armenia.


  • Login