Molybdenum

Transition metal · 95.95 u · group 6, period 5

Molybdenum · Mo

Atomic number42

SymbolMo

CategoryTransition metal

Standard stateSolid

Group · Period · Block6 · 5 · d

Electron configuration[Kr]5s1 4d5

Atomic mass95.95 u

Atomic radius209 pm

Protons / Neutrons / Electrons42 / 54 / 42

Shells (e⁻ per shell)2, 8, 18, 13, 1

Electronegativity (Pauling)2.16

Ionization energy7.092 eV

Electron affinity0.746 eV

Oxidation states+6

Melting point2.90e+3 K · 2.62e+3 °C

Boiling point4.91e+3 K · 4.64e+3 °C

Density10.2 g/cm³

Year discovered1778

CPK color

#54B5B5

State at room temp (25 °C)

solid

Position