Promethium is radioactive,
it belongs to the lanthanoid row.
The use of it is very selective,
the existing quantities low.

It was the last discovered,
no stable isotope existing,
from uranium fission recovered,
a long time missed in the listing.

Two times before it was claimed,
Marinsky, Glendenin and Coryell
the final proof gained,
repeating of their experiment worked well.

Promethium comes from ancient mythology,
there he gave humans light,
one of the uses of Promethiums radioactivity,
is a phosphor, shinig green and bright.

Another one is a nuclear battery,
with a five years life time,
not that revolutionary,
but still a reason to shine.

Promethium is short living and shy,
but with a connection to light,
it at least gives it a try,
to be wonderful and shines bright.

If you are shy as well,
you can shine for yourself a bit,
It feels good, I can tell,
warm like the fire Prometheus once lit.