Atomic Element Z = 42 • Transition Metal
Molybdenum (Mo) — Atomic Data, Electron Shells & Reactions
Molybdenum (symbol Mo, atomic number 42) has a standard atomic weight of 95.95 u and ground-state configuration [Kr] 4d5 5s1.
Atomic Number (Z)
42
IUPAC Symbol
Mo
Standard Atomic Weight
95.95 g/mol
Period / Group / Block
5 / 6 / d-block
Condensed Electron Config
[Kr] 4d5 5s1
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s1
Principal Shell Occupancy
[2, 8, 18, 13, 1]
Pauling Electronegativity
2.16
First Ionization Energy
684 kJ/mol
Covalent Radius
154 pm
Melting Point
2896 K (2622.85 °C)
Boiling Point
4912 K (4638.85 °C)
Density
10.22 g/cm³
Oxidation States
+6, +4
Mo (Z=42) — Valence shell highlighted in vermilion