- a silver-white metallic element, used as an alloy with iron in making hard, high-speed cutting tools. Symbol: Mo; atomic weight: 95.94; atomic number: 42; specific gravity: 10.2.
Origin of molybdenum
Examples from the Web for molybdenum
Production of molybdenum in this country practically began in 1914.The Economic Aspect of Geology
C. K. Leith
It had up to this time been confounded with molybdenum sulphide.
Of these ingredients much the most important are tungsten and molybdenum.Inventors at Work
From sulphuret of molybdenum, dissolved in nitric acid, and some tin filings and a little muriatic acid added.
European steel men have taken to molybdenum more than Americans.Creative Chemistry
Edwin E. Slosson
- a very hard ductile silvery-white metallic element occurring principally in molybdenite: used mainly in alloys, esp to harden and strengthen steels. Symbol: Mo; atomic no: 42; atomic wt: 95.94; valency: 2–6; relative density: 10.22; melting pt: 2623°C; boiling pt: 4639°C
Word Origin and History for molybdenum
metallic element, 1816, from molybdena, used generally for lead-like minerals, from Greek molybdos "lead," also "black graphite," related to Latin plumbum "lead" (see plumb (n.)), and like it probably borrowed from a lost Mediterranean language, perhaps Iberian. The element so called because of its resemblance to lead ore.
- A hard metallic element that is an essential trace element in plant and animal nutrition. Atomic number 42.
- A hard, silvery-white metallic element that resists corrosion and retains its strength at high temperatures. It is used to harden and toughen steel and to make high-temperature wiring. Molybdenum is an essential trace element in plant metabolism. Atomic number 42; atomic weight 95.96; melting point 2,623°C; boiling point 4,639°C; specific gravity 10.22 (at 20°C); valence 2, 3, 4, 5, 6. See Periodic Table.