Definitions for promethium
prəˈmi θi əmprome·thi·um

Princeton's WordNetRate this definition:0.0 / 0 votes

1. promethium, Pm, atomic number 61noun

   a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium

WiktionaryRate this definition:0.0 / 0 votes

1. promethiumnoun

   a metallic chemical element (symbol Pm) with an atomic number of 61.

2. Etymology: 1945. From the name of the Greek god Prometheus, who stole the fire from Mount Olympus and brought it down to mankind.

WikipediaRate this definition:0.0 / 0 votes

1. Promethium

   Promethium is a chemical element with the 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 Earth's crust at any given time. Promethium is one of only two radioactive elements that are followed in the periodic table by elements with stable forms, the other being technetium. Chemically, promethium is a lanthanide. Promethium shows only one stable oxidation state of +3. In 1902 Bohuslav Brauner suggested that there was a then-unknown element with properties intermediate between those of the known elements neodymium (60) and samarium (62); this was confirmed in 1914 by Henry Moseley, who, having measured the atomic numbers of all the elements then known, found that atomic number 61 was missing. In 1926, two groups (one Italian and one American) claimed to have isolated a sample of element 61; both "discoveries" were soon proven to be false. In 1938, during a nuclear experiment conducted at Ohio State University, a few radioactive nuclides were produced that certainly were not radioisotopes of neodymium or samarium, but there was a lack of chemical proof that element 61 was produced, and the discovery was not generally recognized. Promethium was first produced and characterized at Oak Ridge National Laboratory in 1945 by the separation and analysis of the fission products of uranium fuel irradiated in a graphite reactor. The discoverers proposed the name "prometheum" (the spelling was subsequently changed), derived from Prometheus, the Titan in Greek mythology who stole fire from Mount Olympus and brought it down to humans, to symbolize "both the daring and the possible misuse of mankind's intellect". However, a sample of the metal was made only in 1963. The two sources of natural promethium are rare alpha decays of natural europium-151 (producing promethium-147) and spontaneous fission of uranium (various isotopes). Promethium-145 is the most stable promethium isotope, but the only isotope with practical applications is promethium-147, chemical compounds of which are used in luminous paint, atomic batteries and thickness-measurement devices. Because natural promethium is exceedingly scarce, it is typically synthesized by bombarding uranium-235 (enriched uranium) with thermal neutrons to produce promethium-147 as a fission product.

ChatGPTRate this definition:0.0 / 0 votes

1. promethium

   Promethium is a radioactive chemical element with the symbol Pm and atomic number 61. It is a part of the lanthanide series and is classified as a rare-earth element. Promethium does not naturally occur on Earth and is typically produced synthetically in nuclear reactors. It is primarily used in the production of batteries for scientific equipments. Promethium has several isotopes, all of which are radioactive.

WikidataRate this definition:0.0 / 0 votes

1. Promethium

   Promethium, originally prometheum, is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is one of only two such elements that are followed in the periodic table by elements with stable forms, a distinction shared with technetium. Chemically, promethium is a lanthanide, which forms salts when combined with other elements. Promethium shows only one stable oxidation state of +3; however, a few +2 compounds may exist. In 1902, Bohuslav Brauner suggested there was an element with properties intermediate between those of the known elements neodymium and samarium; this was confirmed in 1914 by Henry Moseley who, having measured the atomic numbers of all the elements then known, found there was no element with atomic number 61. In 1926, an Italian and an American group claimed to have isolated a sample of element 61; both "discoveries" were soon proven to be false. In 1938, during a nuclear experiment conducted at Ohio State University, a few radioactive nuclides were produced that certainly were not radioisotopes of neodymium or samarium, but there was a lack of chemical proof that element 61 was produced, and the discovery was not generally recognized. Promethium was first produced and characterized at Oak Ridge National Laboratory in 1945 by the separation and analysis of the fission products of uranium fuel irradiated in a graphite reactor. The discoverers proposed the name "prometheum", derived from Prometheus, the Titan in Greek mythology who stole fire from Mount Olympus and brought it down to humans, to symbolize "both the daring and the possible misuse of mankind's intellect." However, a sample of the metal was made only in 1963.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Promethium

   Promethium. A radioactive element of the rare earth family of metals. It has the atomic symbol Pm, atomic number 61, and atomic weight 147. It has been used in the construction of atomic batteries, in the preparation of self-luminous compounds, and as a beta-particle source for thickness gauges.

Matched Categories

1. • Metallic Element

Usage in printed sourcesFrom: 

1. [["1942","49"],["1944","6"],["1947","4"],["1948","2"],["1949","18"],["1950","63"],["1951","43"],["1952","87"],["1953","75"],["1954","119"],["1955","84"],["1956","130"],["1957","31"],["1958","77"],["1959","119"],["1960","182"],["1961","275"],["1962","76"],["1963","154"],["1964","138"],["1965","157"],["1966","246"],["1967","144"],["1968","111"],["1969","163"],["1970","129"],["1971","110"],["1972","179"],["1973","96"],["1974","140"],["1975","59"],["1976","117"],["1977","91"],["1978","102"],["1979","88"],["1980","80"],["1981","106"],["1982","87"],["1983","66"],["1984","65"],["1985","61"],["1986","82"],["1987","81"],["1988","211"],["1989","123"],["1990","72"],["1991","74"],["1992","100"],["1993","105"],["1994","152"],["1995","80"],["1996","97"],["1997","129"],["1998","119"],["1999","170"],["2000","106"],["2001","144"],["2002","201"],["2003","149"],["2004","200"],["2005","69"],["2006","116"],["2007","188"],["2008","70"]]

How to pronounce promethium?

1. Alex

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How to say promethium in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of promethium in Chaldean Numerology is: 1

2. Pythagorean Numerology

   The numerical value of promethium in Pythagorean Numerology is: 3

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References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=promethium
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Promethium
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Promethium
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=promethium
6. ^ Usage in printed sources
   https://books.google.com/ngrams/graph?content=promethium