Definition of protactinium Protactinium
pro•tac•tin•i•um
We found 5 definitions of protactinium from 5 different sources.
Advertising
What does protactinium mean?
WordNet
NounPlural: protactiniums |
||
| protactinium - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | ||
| protoactinium, Pa, atomic number 91 | ||
= synonym
= antonym
= related word
= antonym
= related word
Wiktionary 
- protactinium (Noun)
A chemical element symbol Pa with atomic number 91.
OmegaWiki DictionaryOmegaWiki Dictionary Ω
-
protactinium
Chemical element with symbol Pa and atomic number 91. It is a silvery actinide.
Wikipedia 
-
Protactinium is a chemical element with the symbol Pa and atomic number 91.
Notable Characteristics.
Protactinium is a silver metallic element that is in the actinide group, with a bright metallic shine that it keeps for some time in the air. It is superconductive at temperatures below 1.4 K.
Applications.
Due to its scarcity, high radioactivity and toxicity, there are currently no uses for protactinium outside of basic research.
Protactinium-231 (which is made by the alpha decay of Uranium-235 followed by beta decay of Thorium-231) could possibly sustain a nuclear chain reaction and might be used to build a nuclear weapon. The critical mass, according to Walter Seifritz, is 750±180 kg. Other authors conclude that no chain reactions are possible in Protactinium-231.
History.
Protactinium was first discovered in 1913, when Kasimir Fajans and O. H. Göhring encountered short-lived isotope 234m-Pa, with a half-life of about 1.17 minutes, while they were studying the decay chain of 238-U. They gave the new element the name "Brevium" (Latin "brevis", brief, short); the name was changed to "Protoactinium" in 1918 when two groups of scientists (Otto Hahn and Lise Meitner of Germany and Frederick Soddy and John Cranston of the UK) independently discovered 231-Pa. The name was shortened to "Protactinium" in 1949.
In 1961, the United Kingdom Atomic Energy Authority was able to produce 125 g of 99.9% pure protactinium, processing 60 tons of waste material in a 12-stage process and spendi
Part of speech
🔤- protactinium, noun, singular of protactiniums.
Pronunciation
Word frequency
Sign Language
Your last searches
Last searches
Advertising
Advertising