Promethium (Pm)
"Promethium is the elusive Light-Bringer, radiating a steady, powerful glow from within, empowering the darkest corners with its unique energy!"
A memorable persona to anchor Pm in your mind.
7.26
Grams per cm³
1042
Celsius (°C)
236
Radius (pm)
Daily Life Link
Think of those glow-in-the-dark stickers on your ceiling, but way more powerful and for serious tech!
Discovery & History
Year Discovered
1945
Discovered By
Jacob A. Marinsky, Lawrence E. Glendenin & Charles D. Coryell
Origin of Name
"Promethium is named after Prometheus of Greek mythology who stole fire from the Gods and gave it to humans."
Technical Properties
Atomic Mass
[145] u
Standard State
solid
Boiling Point
3000°C
Electron Configuration
[Xe] 4f56s2
1st Ionization Energy
5.55 eV
Electron Affinity
N/A
Oxidation States
"A soft, silvery-metallic glint, but don't get too close – it's always buzzing with energy!"
Did You Know?
Promethium is so rare it was predicted *before* it was officially discovered! Scientists noticed a gaping hole for element 61 in the periodic table years earlier.
It's named after Prometheus, the Greek Titan who famously stole fire from the gods and gave it to humanity – a perfect name for an element that literally 'shines' with its own internal energy!
Promethium is one of only two elements in the first 82 on the Periodic Table that has absolutely NO stable isotopes. Every single Promethium atom is a ticking radioactive clock!
You won't find Promethium veins in a mine! It's virtually absent from Earth's crust in natural quantities, primarily formed as a byproduct when heavier elements like Uranium split apart.