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atomic number 15

n.
1.a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells

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    Idiom of the Day

    laugh up one's sleeve
    to laugh quietly to oneself
    I was laughing up my sleeve when I learned that my friend would have to clean the bathroom at work.



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    fossil

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    My Account / Test History
    Invention
    Invention : calendar, modern (gregorian)
    Year : 1582
    Inventor : pope gregory xiii
    Country : italy.      .. More >>
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