Tm

Thulium

Atomic Number 69 · Metal piece

The least abundant naturally occurring lanthanide. Used in portable X-ray devices and high-temperature superconductors.

Atomic Mass

168.93 u

Category

Lanthanide

Phase (STP)

Solid

Density

9.321 g/cm³

Melting Point

1545 °C

Boiling Point

1950 °C

Electronegativity

1.25 (Pauling)

Atomic Radius

175 pm

Electron Configuration

[Xe] 4f13 6s2

Discovered

1879 — Per Teodor Cleve

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Sample form: Metal piece

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