61Pm145
Promethium
Lanthanide · element 61 · f-block (shown below the main table)
Quick facts
| Symbol | Pm |
|---|---|
| Atomic number | 61 |
| Relative atomic mass | 145 |
| Category | Lanthanide |
| Position | f-block (shown below the main table) |
| State at 20 °C | Solid |
| Melting point | 1,042 °C |
| Boiling point | 3,000 °C |
| Density | 7.26 g/cm³ |
| Electronegativity | 1.13 |
| Electron configuration | [Xe] 4f5 6s2 |
About Promethium
Promethium has the symbol Pm and atomic number 61, which means every promethium atom has 61 protons in its nucleus and, in a neutral atom, 61 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 1,042 °C and boils at 3,000 °C.
Explore it
See where promethium sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.