noun
a series of chemical elements that includes actinium and all the elements with atomic numbers from 89 to 103
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The actinide series is a group of elements in the periodic table that includes actinium, thorium, uranium, and other radioactive elements.
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The actinide series is all those super radioactive elements you don't want to mess with.
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The actinide series is like the bad boys of the periodic table, always causing trouble.
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The actinide series is like the rock stars of the periodic table, with their wild and unpredictable behavior.