Tm

THULIUM

Definition from 'thule or northland. the rarest of all rare elements.

Discovery 1879

Uses x-ray, magnetic material

Group of Elements Lanthanide(SOlid)

Atomic Weight 168.9342

Oxidation State +3

Melting Point 1545

Boiling Point 1727

Density 9.32 g/cm3

Electronegativity 1.2