Chapter 8

⚛️ Row 7: francium to oganesson

The seventh row begins with francium and radium, rare radioactive metals found in nature, and continues, after the actinides, with the superheavy elements 104 to 118. None of these is found in nature: labs in Russia, Germany, the United States and Japan made them a few atoms at a time, and most last less than a second. Their names honour great scientists and the places where they were made. Oganesson completed the table's seventh row in 2016.

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