actinon

ac·ti·non

 (ăk′tə-nŏn′)

n.

A radioactive isotope of radon, Rn-219, having a half-life of 3.96 seconds and produced by the disintegration of actinium.

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[actin(ium) + -on.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

actinon

(ˈæktɪˌnɒn)

n

1. (Elements & Compounds) a radioisotope of radon that is a decay product of radium. Symbol: An or ²¹⁹Rn; atomic no: 86; half-life: 3.92s

2. (Elements & Compounds) another name for actinide

[C20: New Latin, from actinium + -on]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

ac•ti•non

(ˈæk təˌnɒn)

n.

a chemically inert, gaseous, short-lived isotope of radon. Symbol: An; at. no.: 86; at. wt.: 219.

[1925–30]

Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

Thesaurus

Noun

1.

actinon - any of a series of radioactive elements with atomic numbers 89 through 103 actinide, actinoid group, grouping - any number of entities (members) considered as a unit

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