Symbol Mo
Atomic Number 42
Atomic Mass 137.327
Discovered by Molybdenum was discovered by Peter Jacob Hjelm

Chemical Properties of Molybdenum

Group 6 Melting point 2622°C, 4752°F, 2895 K
Period 5 Boiling point 4639°C, 8382°F, 4912 K
Block d Density (g cm−3) 10.2
Atomic number 42 Relative atomic mass 95.95
State at 20°C Solid Key isotopes 95Mo, 96Mo, 98Mo
Electron configuration [Kr] 4d5s1 CAS number 7439-98-7
ChemSpider ID 22374 ChemSpider is a free chemical structure database

What is Molybdenum?

  • Molybdenum (Mo) is a chemical element in the periodic table with atomic number 42, discovered by Carl Wilhelm Scheele in 1778. Its name is derived from the Greek word Molybdos which means lead.
  • It is a silvery white, hard transition metal and has one of the highest melting points of all pure elements.
  • It can be attacked slowly by acids.
  • Molybdenum is known to have 35 different isotopes varying in atomic mass from 83 to 117.

Uses of Molybdenum

  • It is one of the greatest alloying agents as it improves the strength of steel at high temperatures and is applied for use in engines.
  • It is even used as a fertilizer for some plants like cauliflower which is known to have Molybdenum deficiency.
  • It is used as a catalyst for the petroleum industry.

Practise This Question

What happens to the atomic radii of the group IA elements as we go down the group.