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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promethium::noun | Spocien Dictionary
| Type | Words |
|---|---|
| Synonyms | atomic number 61, pm |
| Type of | metal, metallic element |
Examples of promethium
promethium
The second-lightest radioactive element, promethium, has an atomic number of 61.
From the en.wikipedia.org
Promethium is a chemical element whose existence was first predicted by Bohuslav Brauner in 1902.
From the en.wikipedia.org
Natural technetium and promethium are produced in this way.
From the en.wikipedia.org
Quite a few years later, this element 61 was created artificially in nuclear reactors and was named promethium.
From the en.wikipedia.org
Promethium is effectively a man-made element as all its isotopes are radioactive with half-lives shorter than 20 y.
From the en.wikipedia.org
After the 1960s, radium paint was first replaced with promethium paint, and later by tritium bottles which continue to be used today.
From the en.wikipedia.org
The new element is called promethium.
From the en.wikipedia.org
In the second half of the 20th century, radium was progressively replaced by safer radionuclides such as promethium-147 and later tritium.
From the en.wikipedia.org
In nature, spontaneous fission of uranium-238 produces trace amounts of radioactive promethium, but most promethium is synthetically produced in nuclear reactors.
From the en.wikipedia.org
- 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
- Promethium is a chemical element with the symbol Pm and atomic number 61. It is notable for being the only other exclusively radioactive element besides technetium which is followed by chemical elements that have stable isotopes.
- Promethium is the name used for two different fictional substances; one from the DC Comics universe and one from the Marvel Comics universe. These should not be confused with promethium, which is an actual chemical element.
- A metallic chemical element (symbol Pm) with an atomic number of 61
- Symbol:"Pm" Atomic Number:"61" Atomic Mass: (145)amu. This is one of the elements in the lanthanide series of inner transition elements. It may also be classified as a rare earth element. This element is not found in nature and has only been created in a lab. ...
- P-M. For more information on this and other elements, see The elements. And for fun, see Elements by Tom Lehrer. To see this song with captions, go to The Elements song by Tom Lehrer.
