アクチニウム
1. actinium (Ac)
2. ActiniumActinium is a radioactive chemical element with the symbol Ac and atomic number 89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated. Polonium, radium and radon were observed before actinium, but they were not isolated until 1902. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table.
Read “Actinium” on English Wikipedia
Read “アクチニウム” on Japanese Wikipedia
Read “Actinium” on DBpedia
Read “Actinium” on English Wikipedia
Read “アクチニウム” on Japanese Wikipedia
Read “Actinium” on DBpedia
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