Actinon definitions

Actinon

1) Actinide 2) Actinoid 3) Group 4) Grouping
Found on https://www.crosswordclues.com/clue/actinon

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actinon

a chemically inert, gaseous, short-lived isotope of radon that is a member of the actinium series. Symbol: An; at. no.: 86; at. wt.: 219. Also called
Found on https://www.infoplease.com/dictionary/actinon

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