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Definition of Protactinium in English :

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Protactinium meaning in English

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Protactinium

see synonyms of protactinium

Noun

1. atomic number 91, pa, protactinium, protoactinium

a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

WordNet Lexical Database for English. Princeton University. 2010.

Protactinium

see synonyms of protactinium
noun
a toxic radioactive metallic element that occurs in uranium ores and is produced by neutron irradiation of thorium. Symbol: Pa; atomic no: 91; half-life of the most stable isotope, 231Pa: 32 500 years; valency: 4 or 5; relative density: 15.37 (calc.); melting pt: 1572°C
. Former name: protoactinium

Collins English Dictionary. Copyright © HarperCollins Publishers

Protactinium

see synonyms of protactinium
noun
a rare, radioactive, metallic chemical element, one of the actinides, found in pitchblende: symbol, Pa; at. no., 91
see the periodic table of elements in the Reference Supplement

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

Protactinium

see synonyms of protactinium
n. Symbol Pa
A rare, extremely toxic, radioactive, lustrous, metallic element having more than 30 known isotopes and isomers, the most common of which is Pa-231 with a half-life of 32,760 years. Atomic number 91; atomic weight 231.036; melting point 1,572°C; specific gravity 15.37 (calculated); valence 2, 3, 4, 5. See Periodic Table.

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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