actinium

1. (uncountable, usually)A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.

   Actinium

   акти́нийaktínij

   акти́нійaktýnij

   a radioactive element of the actinide series; found in uranium ores

2. A radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores.

   (countable, usually)An atom of this element.

1. Actinium is a radioactive element.

   ruАктиний - радиоактивный элемент.

   deActinium ist ein radioaktives Element.

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2. Actinium is a silvery metal.

   deActinium ist ein silbernes Metall.

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regular