1) Atomic number 61 2) Chemical element 3) Element discovered in 1945 4) Element number 61 5) Element with the symbol Pm 6) Metal 7) Metallic element 8) Synthetic element
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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 combin...
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http://en.wikipedia.org/wiki/Promethium
(Pm), chemical element, only rare-earth metal of transition Group IIIb of the periodic table not detected in nature. Conclusive chemical proof of ... [1 related articles]
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http://www.britannica.com/eb/a-z/p/120
(Pm) A radioactive, metallic element of the lanthanide series. It was first made in 1941 by particle bombardment of neodymium and praseodymium. Promethium occurs in uranium ores in minute amounts. The isotope
147Pm is used in phosphorescent paints, X-ray t...
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<chemical> 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. ... Chemical name: Promethium ... (1...
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(Pm) (pro-me´the-әm) a chemical element, atomic number 61, atomic weight 147.
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(Pm) Type: Term Pronunciation: prō-mē′thē-ŭm Definitions: 1. A radioactive element of the rare earth series, atomic no. 61; first chemically identified in 1945; 145Pm has the longest known half-life (17.7 years).
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Promethium is a metal element with the symbol Pm.
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http://www.probertencyclopaedia.com/browse/GP.HTM
[
n] - a soft silvery metallic element of the rare earth group having no stable isotope
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http://www.webdictionary.co.uk/definition.php?query=promethium
A radioactive element of the rare earth series. Symbol Pm
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Pm noun 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
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Radioactive, metallic element of the lanthanide series, atomic number 61, relative atomic mass 145. It occurs in nature only in minute amounts, produced as a fission product/by-product of uranium in pitchblende and other uranium ores; for a long time it was considered not to occur in nature. The longest-lived isotope has a half-...
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a rare-earth, metallic, trivalent element. Symbol: Pm; at. no.: 61.
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https://www.infoplease.com/dictionary/promethium
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