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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

    sell (someone) on (something - a plan or idea)
    to convince someone of something
    I could not sell my friend on my idea that we buy a new computer together.



    1.
    We use the preposition ________ with months.

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