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mass number

n.
1.the sum of the number of neutrons and protons in an atomic nucleus

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Word of the Day

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  • mass noun
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  • mass murderer
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  • implausible
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    Idiom of the Day

    take up arms against (someone or something)
    to get ready to fight or make war
    The citizens of the small country were not willing to take up arms to change their government.



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