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atomic number 91

n.
1.a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead

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    Idiom of the Day

    tail between one's legs
    feeling ashamed or beaten
    The salesman resigned from his company with his tail between his legs after he told a lie about his expense account.



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    Fact
    Colored diamonds are caused by impurities such as nitrogen (yellow), boron (blue). With red diamonds being due to deformities in the structure of the stone, and green ones being the result of irradiation.      .. More >>
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