Name: Thulium

Atomic Symbol and Mass Number: Tm [69]

Electron Configuration: [Xe] 4f     6s

Atomic Radii: 176 pm

Electron Affinity: 50 kJ mol‑1

Oxidation States: +2, +3

Electronegativity Value: 1.25

Elemental Group: Lanthanide

Uses and Properties:

• It is a silvery metal that can be cut with a knife due to its soft texture and is both ductile and malleable

• When irradiated in a nuclear reactor, thulium produces an isotope that emits x-rays.

• A 'button' of this isotope is used to make a lightweight, portable x-ray machine for medical use. 

• Thulium is used in lasers with surgical applications.

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Lewis Diagram: