PERIODIC TABLE
Promethium
Atomic No. 61
Pm
Promethium
About Promethium
Promethium is a radioactive lanthanide with atomic number 61 and no stable isotopes. Promethium commonly forms +3 compounds, and recent experiments have directly characterized its coordination chemistry in solution. Promethium 147 has been used in specialized radiation sources and nuclear batteries, but its radioactivity and limited availability restrict it to specialized technical and research work.
Properties
- Atomic Number
- 61
- Atomic Symbol
- Pm
- Atomic Mass
- 145
- CAS No.
- 7440-12-2
- Density
- 7.264 g/cm³
- Series
- lanthanoid
- Melting Point
- 1,100°C
- Boiling Point
- 3,000°C
- Thermal Conductivity
- 0.15 W/cm °C
- Heat of Fusion
- 7.7 kJ/mol
- Heat of Vaporization
- 290 kJ/mol
- Electrical Conductivity
- 1.3×106 S/m
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