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actinon

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ac⋅ti⋅non

  [ak-tuh-non]
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–noun Chemistry.
a chemically inert, gaseous, short-lived isotope of radon that is a member of the actinium series. Symbol: An; atomic number: 86; atomic weight: 219.
Also called actinium emanation.

Origin:
1925–30; < NL; see actinium, -on 2
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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ac·ti·non   (āk'tə-nŏn')   
n.  A radioactive, inert, gaseous isotope of radon, with a half-life of 3.92 seconds.

[actin(ium) + -on2.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: ac·ti·non
Pronunciation: 'ak-t&-"nän
Function: noun
: a gaseous radioactive isotope of radon that has a half-life of aboutfour seconds
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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