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Molybdenum


5
42
95.94
KEY
Chemical Element Symbol Key

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Molybdenum
Columbia Encyclopedia
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Symbol: Mo
Atomic Number: 42
Atomic Weight: 95.94
Element Classification: Transition Metal
Discovered By: Carl Wilhelm Scheele
Discovery Date: 1778 (Sweden)
Name Origin: Greek: molybdos (lead).
Density (g/cc): 10.22
Melting Point (K): 2890
Boiling Point (K): 4885
Appearance: Silvery white, hard metal
Atomic Radius (pm): 139
Atomic Volume (cc/mol): 9.4
Covalent Radius (pm): 130
Ionic Radius: 62 (+6e) 70 (+4e)
Specific Heat (@20°C J/g mol): 0.251
Fusion Heat (kJ/mol): 28
Evaporation Heat (kJ/mol): ~590
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): 380.00
Pauling Negativity Number: 2.16
First Ionizing Energy (kJ/mol): 684.8
Oxidation States: 6, 5, 4, 3, 2, 0
Electronic Configuration: [Kr] 4d5 5s1
Lattice Structure: Body-Centered Cubic (BCC
Lattice Constant (Å): 3.150
Lattice C/A Ratio: n/a


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