Periodic Table
42
Mo
95.95
Molybdenum
Transition MetalConfig exception (4d⁵5s¹); high melting; enzyme cofactor.
Electronic Configuration
[Kr] 4d⁵ 5s¹or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d⁵ 5s¹
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
13e⁻n=4
1e⁻n=5
Properties
Atomic number
42
Atomic mass
95.95 u
Category
Transition Metal
Block / Group / Period
d · 6 · 5
Valence electrons
1
Oxidation states
+2 to +6
Electronegativity
2.16
Atomic radius
190 pm
Ionization energy
684 kJ/mol
Electron affinity
72 kJ/mol
Melting point
2896 K / 2623 °C
Boiling point
4912 K / 4639 °C
Density
10.22 g/cm³
State at 25 °C
solid
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