NO. 071Lanthanide

Lu

Lutetium

Lutetium is a dense rare earth metal used in PET scan detectors and catalysts.

Crystal Structure

Hexagonal close-packed (hcp)

Atomic Mass174.97 u

Density9.84 g/cm³

Melting Point1925 K

Boiling Point3675 K

Atomic Radius173 pm

Electronegativity1.27

Ionization Energy523 kJ/mol

Electron Affinity50 kJ/mol

Bonding TypeMetallic

Oxidation States3

Acid/BaseBasic

ReactivityMedium

Electron Configuration

[Xe] 4f14 5d1 6s2

Discovered ByGeorges Urbain

Year1907

Known Isotopes

Lu-175Lu-176