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periodic law

n.
1.(chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers

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    Idiom of the Day

    live in an ivory tower
    to be unaware of the realities of everyday life
    The university professor lives in an ivory tower and does not seem to understand what is going on in the world.



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    You'll have to get used to ________ on the right when you live there.

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