Promethium (Pm)
A fascinating lanthanide element.
Promethium is element 61 on the periodic table.
Element properties
- Atomic number
- 61
- Symbol
- Pm
- Atomic mass
- 145 u
- Category
- Lanthanide
- Period
- 6
- Group
- Not assigned
- Block
- f
- State
- Solid
- Electron configuration
- [Xe] 4f5 6s2
- Electronegativity (Pauling)
- 1.13
- Density
- 7.26 g/cm³
- Melting point
- 1042 °C
- Boiling point
- 3000 °C