Tm
Thulium Symbol (Tm)
Thulium is element 69 of the periodic table. Copy its symbol Tm and see its atomic weight, electron configuration and physical properties.
What does Tm mean?
Tm is the chemical symbol for thulium, element number 69 in the periodic table. Thulium is a lanthanide in the f-block, period 6. It is a solid at room temperature and was discovered in 1879.
Codes and properties
| Chemical symbol | Tm |
|---|---|
| Atomic number (Z) | 69 |
| Atomic weight (PubChem) | 168.93422 |
| Group / period | f-block / 6 |
| Element category | lanthanide |
| Electron configuration | [Xe]6s² 4f¹³ |
| State at 20 °C | Solid |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 1.25 |
| Melting point | 1818 K (1544.85 °C) |
| Boiling point | 2223 K (1949.85 °C) |
| Density | 9.32 g/cm³ |
| Discovered | 1879 |
How to type Tm
- Plain text: type
Tm— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as H₂O — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Tm}in math mode, or use the mhchem package:\ce{Tm}. - HTML:
Tm; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for thulium?
The chemical symbol for thulium is Tm.
What is the atomic number of thulium?
Thulium has atomic number 69, meaning each atom has 69 protons.
What is the electron configuration of thulium?
The ground-state electron configuration of thulium is [Xe]6s² 4f¹³.
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Reference: Thulium on PubChem (NIH)