Promethium is a chemical element; it has symbol Pm and atomic number 61. All of its isotopes are radioactive; it is extremely rare, with only about 500–600 grams naturally occurring in the …

promethium (Pm), chemical element, the only rare-earth metal of the lanthanide series of the periodic table not found in nature on Earth.

Promethium is named after Prometheus of Greek mythology who stole fire from the Gods and gave it to humans. The image is based on a scene from an Ancient Greek vase. It depicts the …

Promethium was discovered in 1945. It was the last rare earth lanthanide element to be discovered. It is very radioactive element but unstable. It is used in luminous paint and atomic …

Apr 8, 2025 · Promethium (symbol Pm and atomic number 61) is a rare earth element and one of only two elements with atomic numbers under 83 that have no stable isotopes (the other is …

May 11, 2025 · Promethium is a radioactive metal discovered in 1945 that is extremely rare on Earth. All promethium isotopes are radioactive, and they can produce x-rays through beta …

May 22, 2024 · Promethium is very rare; only about a pound occurs naturally in the Earth’s crust at any given time. Unlike other rare earth elements, only minute quantities of synthetic …

Promethium shows promise as a portable X-ray source, and it may become useful as a heat source to provide auxiliary power for space probes and satellites. More than 30 promethium …

May 14, 2025 · Promethium is in growing demand thanks to its use in things like luminous paint, for lighting, and in small nuclear batteries that power pacemakers, communications equipment, …

Promethium was first produced and characterized at Oak Ridge National Laboratory in 1945 by Jacob A. Marinsky, Lawrence E. Glendenin and Charles D. Coryell. It was produced by the …