actinium emanation

noun Chemistry. Unabridged


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.

1925–30; < Neo-Latin; see actinium, -on2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actinon (ˈæktɪˌnɒn)
1.  a radioisotope of radon that is a decay product of radium. Symbol: An or 219Rn; atomic no: 86; half-life: 3.92s
2.  another name for actinide
[C20: New Latin, from actinium + -on]

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