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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

    know of (someone or something)
    to be aware of someone or something, to have heard of someone or something
    I do not know of any good restaurants near my house.



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    The ________ was hard to follow after the rain.

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    The period between midnight and dawn is the best time to look for shooting stars. On a normal night you can see between five and ten an hour. In a desert, you can see one every eight minutes.      .. More >>
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