Thulium (Tm), element 69 – Learn Acer periodic table

Lanthanide, atomic number 69.

Thulium is a chemical element with symbol Tm and atomic number 69. It is the thirteenth and antepenultimate (third-last) element in the lanthanide series. Like the other lanthanides, the most common oxidation state is +3, seen in its oxide, halides and other compounds.

Symbol Tm. Atomic mass 168.934222 u. Group 3, period 6. Electron configuration [Xe] 4f13 6s2. Electrons per shell 2, 8, 18, 31, 8, 2. State at room temperature: Solid. Melting point 1544.8 °C, boiling point 1949.8 °C. Discovered by Per Teodor Cleve.

Element data from Wikipedia, CC BY-SA 3.0.

Thulium (Tm), element 69 – Learn Acer periodic table

Thulium

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