Superactinides

The superactinides are elements with atomic numbers 122 to 153.[1] They are the furthest group in the Periodic table. As of 2021, none has been found. Scientists think they must have half-lives of only nanoseconds.

References
  1. Christopher McFadden (April 18, 2018). "How the Periodic Table Came Together: The History of Science's Great Map". Retrieved November 10, 2021.
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