Promethium is naturally produced as a result of spontaneous fission of uranium-238 and alpha decay of europium-151. But there is only a very little amount can be found in ores. Since Promethium is a highly radioactive element, a great care is needed when handling. Promethium can even emit X-rays when it decays; but not used in biology due to high toxicity.

Promethium is widely used in nuclear batteries for converting the light in to electric current. I’m sure you may have seen luminous parts of the watches which makes the time readable in the dark and Promethium has been used for making it.

Atomic Number & Chemical Properties


Element Basics:

Chemical Symbol: Pm
Atomic Number: 61
Atomic Weight: 144.9127
Element Classification: Rare Earth Element (Lanthanide Series)
Discovered By: J.A. Marinsky, L.E. Glendenin, C.D. Coryell
Date of Discovery: 1945 (United States)
Origin of Name: Named for the Greek god, Prometheus.

How to Recognize it at a Party:

Seriously Atomic Information:

Density (g/cc): 7.2
Melting Point (°K): 1441
Boiling Point (°K): 3000
Atomic Radius (pm): n/a
Atomic Volume (cc/mol): n/a
Covalent Radius (pm): 163
Ionic Radius: 97.9 (+3e)
Pauling Negativity Number: 0.0
First Ionizing Energy (kJ/mol): 536
Oxidation States: 3
Electronic Configuration: [Xe] 4f5 6s2

Getting Intimate with Promethium:

Lattice Structure: n/a
Lattice Constant (Å): n/a
Lattice C/A Ratio: n/a
Specific Heat (@20°C J/g mol): 0.185
Fusion Heat (kJ/mol): n/a
Evaporation Heat (kJ/mol): n/a
Thermal Conductivity (@25°C W/m K):
Debye Temperature (°K): n/a


Society’s Questions About Promethium:

Have you ever wondered what everyone else in the world thinks about Promethium? Is anyone else looking for it too? If so, why? What do they want?

The following list shows the most common online questions about the element Promethium. Are your questions the same or different from everyone else’s?

Top Promethium Topics:

  • promethium 93
  • element promethium 17
  • promethium cost 17
  • interesting facts on promethium 5
  • promethium origin 5
  • chemical characteristics of promethium 3
  • pics of promethium 3
  • promethium chemical properties 3
  • promethium price 3
  • promethium state 3
  • what is a promethium board 3
  • where in the united states was promethium discovered 3