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 …

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 …

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 …

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 …

Little is yet generally known about the properties of metallic promethium. More than 30 promethium compounds have been prepared. Promethium is a rare earth metal. It appears …

Chemical element, Promethium, information from authoritative sources. Look up properties, history, uses, and more.

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 …