Molybdenum (Mo)

Atomic Number42
Atomic Mass95.951 u
CategoryTransition metal
Electron Config[Kr] 4d⁵ 5s¹
Appearancegray metallic
Density (STP)10280 g/L
Melting Point2896 K
Boiling Point4912 K
Electronegativity2.16 (Pauling)
Ionization Energy684.3 kJ/mol
Atomic Radius145 pm
Crystal StructureBody-centered Cubic
Discovered ByCarl Wilhelm Scheele (1781)

Brief Introduction

Molybdenum (Mo) is a silvery-gray, hard transition metal with one of the highest melting points of all elements. It is essential for life and important in industrial applications. Key details about Molybdenum (Mo) are as follows:

Uses: Primarily used in steel alloys (stainless steel, tool steel, high-strength steel) to increase strength, hardness, and corrosion resistance, superalloys for jet engines, catalysts in petroleum refining (hydrodesulfurization), lubricants (molybdenum disulfide, MoS₂), electrodes, and in pigments.

Production/Extraction: Extracted from molybdenite (MoS₂) ore through roasting and further processing. Also obtained as a byproduct of copper mining. China, Chile, and the United States are major producers.

History: Molybdenite (molybdenum sulfide) was confused with lead ore and graphite for centuries. Identified as a distinct element by Carl Wilhelm Scheele in 1778. First isolated by Peter Jacob Hjelm in 1781. Named from Greek "molybdos" (lead-like).

Health Effects & Safety: Essential trace element for animals and plants (cofactor for enzymes involved in sulfur metabolism). Deficiency is rare in humans. Excess molybdenum can interfere with copper metabolism. Molybdenum compounds have low toxicity overall.

Price/Market: Price sensitive to steel production demand. Molybdenum oxide and ferromolybdenum are main commercial forms. Recycling from scrap steel is significant. Supply relatively stable.

Price/Market: Price sensitive to steel production demand and mining output. Classified as a critical mineral for defense and energy applications.

Properties: Very high melting point (2623°C, sixth highest of all elements), excellent high-temperature strength, low thermal expansion, good electrical conductor, forms protective oxide, exhibits multiple oxidation states (+4 and +6 most common), and molybdenum disulfide is an excellent solid lubricant.

← Niobium (Nb) · Technetium (Tc) →

Periodic Table