Molybdenum 
Molybdenum is a metallic element which is most frequently used as an alloying addition in alloy and stainless steels. The alloying versatility is unmatched because its addition enhances strength, hardenability, weldability, toughness, elevated temperature strength and corrosion resistance. One of the unique features of Molybdenum, as distinct from other heavy metals, is that laboratory tests have shown its compounds to be of low toxicity.
Molybdenum From Wikipedia, the free encyclopedia
Molybdenum is derived from the Greek meaning ‘lead-like’.
It is a Group 6 chemical element with the symbol Mo and atomic number 42.
It has the sixth-highest melting point of any element, and for this reason it is often used in high-strength steel alloys.
Molybdenum was discovered in 1778 by Carl Wilhelm Scheele and first isolated in 1781 by Peter Jacob Hjelm.
The world's largest producers of molybdenum materials are the United States, Canada, Chile, Russia, and China.
Molybdenum is mined as a principal ore, and is also recovered as a byproduct of copper and tungsten mining.
Molybdenum is the 42nd-most-abundant element in the universe, and the 25th-most-abundant element in earth's oceans. The Russian Luna 24 mission discovered a single molybdenum-bearing grain (1 × 0.6 µm) in a pyroxene fragment taken from Mare Crisium on the Moon. Although current molybdenum production meets demand, roasters and refiners are expected to run into a shortfall between 2009 and 2015
