Molybdenum

Atomic symbol: Mo
Atomic number: 42
Atomic mass: 95.95

Appearance: Gray metallic solid at 25°C

Group: 6
Period: 5
Series: Transition metals
Block: d
Electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s¹

Often confused with lead.

One of 5 major refractory metals- metals with very high resistance to heat and wear. (Tungsten, Molybdenum, Rhenium, Tantalum, and Niobium)

Toxic.

Fun Fact! Previously used to make pencils before graphite became common.