69Tm168.93
Thulium
Lanthanide · element 69 · f-block (shown below the main table)
Quick facts
| Symbol | Tm |
|---|---|
| Atomic number | 69 |
| Relative atomic mass | 168.93 |
| Category | Lanthanide |
| Position | f-block (shown below the main table) |
| State at 20 °C | Solid |
| Melting point | 1,545 °C |
| Boiling point | 1,950 °C |
| Density | 9.32 g/cm³ |
| Electronegativity | 1.25 |
| Electron configuration | [Xe] 4f13 6s2 |
About Thulium
Thulium has the symbol Tm and atomic number 69, which means every thulium atom has 69 protons in its nucleus and, in a neutral atom, 69 electrons. At room temperature it is a solid.
Lanthanides are the first row of the f-block. Many are used in strong magnets, screens and lasers.
It melts at 1,545 °C and boils at 1,950 °C.
Explore it
See where thulium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.