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Thulium

(Tm)

Category

Lanthanoid

Series

lanthanide

Relative atomic mass

168.93422

Density

9.321

Melting point (°C)

1545

Boiling point (°C)

1950

Electronegativity (Pauling)

1.25

Discovery year

1879

Discovered by

Per Teodor Cleve

created by @lukaswyss

Thulium (Tm) – Element 69