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拡張周期表
Wikipedia definition
1. Extended periodic tableThere are currently seven periods in the periodic table of chemical elements, culminating with atomic number 118. If further elements with higher atomic numbers than this are discovered, they will be placed in additional periods, laid out (as with the existing periods) to illustrate periodically recurring trends in the properties of the elements concerned.
Read “Extended periodic table” on English Wikipedia
Read “拡張周期表” on Japanese Wikipedia
Read “Extended periodic table” on DBpedia

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