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actinide series

n.
1.a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
2.(chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers

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    Idiom of the Day

    a marvel to behold
    someone or something that is quite wonderful or exciting to see
    The new bridge is a marvel to behold and many tourists want to see it.



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