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Only a Few Grams of This Element Exist—and Scientists Have Used It to Break the Rules of the Periodic Table
What makes berkelium interesting compared to other actinides is that it has a tetravalent oxidation state (a ... is located above actinides in the periodic table. “The electronic structure ...
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US’ new radioactive molecule discovery challenges periodic table post uranium
This contradicts traditional periodic table expectations ... “But the berkelium ion is much happier in the +4 oxidation state ...