Promethium

Part of speech: noun

Pronunciation: /pɹoʊˈmiːθiəm/

Definitions

1. A synthetic and radioactive metal found in the lanthanide series, this element is recognized for its luminescent properties and applications in specialized nuclear technologies
2. A rare and radioactive element belonging to the lanthanide series, it is known for its ability to emit light and its use in various advanced nuclear applications
3. This element, classified within the lanthanides, is a synthetic metal noted for its radioactivity and its luminescent characteristics in nuclear technology

Etymology: Promethium is one of the few chemical elements named after a figure from myth, and the choice was deliberate: Prometheus, in Greek legend, stole fire from the gods and gave it to humankind, which suited an element that came out of the nuclear reactors and fission-product work of the 1940s. The name was assigned in 1945, when the element was first identified from fission products, and the "-ium" ending follows the convention used for metallic elements such as lanthanum and neodymium. The element itself is a rare radioactive metal in the lanthanide series, and it has no stable isotopes, so it occurs naturally only in trace amounts. The mythological link to fire fits its origin in nuclear processes rather than in any ordinary chemistry of the earth.