Actinon

Japanese: アクチノン
Actinon
An isotope of radon; former name for 2 1 9 Rn. Also written as An. Half-life: 3.92 seconds. The actinides (the 14 elements excluding actinium, number 89) were also sometimes called actinons.
→Related article Emanation

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
ラドンの同位体，219Rnの旧称。Anとも表す。半減期3.92秒。アクチニド元素（アクチノイドから89番のアクチニウムを除いた14元素）をアクチノンと呼んだこともある。
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