<![CDATA[Actinium]]>A supposed metal, said by Phipson to be contained in commercialzinc; -- so called because certain of its compounds are darkened byexposure to light.

]]>https://definedictionarymeaning.com/topic/16267/actiniumRSS for NodeTue, 23 Jun 2026 10:28:33 GMTWed, 22 Mar 2017 02:37:32 GMT60<![CDATA[Reply to Actinium on Wed, 17 Jun 2020 16:44:04 GMT]]>The chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores.

]]>https://definedictionarymeaning.com/post/270532https://definedictionarymeaning.com/post/270532Wed, 17 Jun 2020 16:44:04 GMT<![CDATA[Reply to Actinium on Wed, 17 Jun 2020 16:24:02 GMT]]>a chemical element that is a soft, silver-white metal and is radioactive :

]]>https://definedictionarymeaning.com/post/270525https://definedictionarymeaning.com/post/270525Wed, 17 Jun 2020 16:24:02 GMT